Boolean search strings for teachers: grade level, subject, certification and the tutor problem

"Teacher" is a word that half the workforce has used on a resume at some point. It matches yoga teachers, piano teachers, Sunday school volunteers, corporate trainers, private tutors and people who taught English abroad for a summer, alongside the certified classroom teachers a school actually needs. And a certified third-grade teacher is not the same hire as a certified high school chemistry teacher, even though both are "teachers."

Grade level, subject and certification are what sort them. Below are ten strings by teaching role, and what Indeed, LinkedIn and Google support as of October 2026. For the hiring process after the search, see the interview guide for teachers.

Certification, grade level and subject: what changes a teacher search

• Certification is issued by each state. Each state's education agency or standards board issues teaching certificates or licenses, with its own names, levels and subject areas. Texas, New York and California publish public lookups: the TEA certificate lookup, New York's certificate holder lookup and California's educator search, as of October 2026. This is not legal advice.
• Candidates use different words for the same thing. "Certified," "licensed," "credentialed" (common in California) and "endorsed" all appear. Put them in one OR block rather than guessing the client state's term.
• Subject and grade range matter more than the word certified. A certificate usually covers particular subjects and grades. A teacher certified for elementary grades may not be able to teach high school math. Search the subject and level, then confirm the certificate's range on the lookup.
• Licensure tests. ETS publishes Praxis requirements and passing scores by state, and some states use their own exams instead. Candidates rarely list test scores; treat them as a screening question, not a search term.
• National Board Certification. The National Board for Professional Teaching Standards awards National Board Certified Teacher (NBCT), a voluntary advanced credential with a maintenance requirement and a public directory.

Ten Boolean strings by teaching role

Swap in the subject, grade level and state from your own intake; these are examples.

Classroom teachers

1. Elementary teacher — Indeed Smart Sourcing
("elementary teacher" OR "elementary school teacher" OR "classroom teacher") AND skill: ("guided reading" OR "classroom management" OR "differentiated instruction") NOT ("teaching assistant" OR tutor OR yoga)

2. Secondary math teacher — LinkedIn general search
("math teacher" OR "mathematics teacher") AND (algebra OR geometry OR calculus) AND ("high school" OR "middle school") NOT (tutor OR "teaching assistant" OR recruiter)

3. Science teacher — Indeed Smart Sourcing
("science teacher" OR "chemistry teacher" OR "biology teacher" OR "physics teacher") AND skill: ("lab safety" OR "laboratory" OR ngss) AND ("high school" OR "middle school")

4. Certified teacher by field of study — Indeed Smart Sourcing
("teacher") AND ("teaching certificate" OR "teaching license" OR "certified teacher" OR "teaching credential") AND fieldofstudy: education NOT (tutor OR yoga)

Specialized roles

5. Special education teacher — Indeed Smart Sourcing
("special education teacher" OR "intervention specialist" OR "resource teacher") AND skill: (iep OR "individualized education program" OR "behavior intervention")

6. ESL or bilingual teacher, U.S. schools — LinkedIn general search
("esl teacher" OR "ell teacher" OR "bilingual teacher" OR "english learner teacher") AND (esl OR "english as a second language" OR tesol) AND ("public school" OR district OR "k-12") NOT (tefl OR "teach abroad" OR "online english")

7. Career changer or alternative certification — LinkedIn general search
("alternative certification" OR "alternative route" OR "teaching fellow" OR "intern certificate") AND (teacher) AND (stem OR math OR science OR "special education")

8. National Board Certified Teacher — LinkedIn general search
("national board certified teacher" OR nbct OR "national board certification") AND (teacher OR "instructional coach")

Search-engine X-ray

9. Public profiles by role and metro — Google X-ray
site:linkedin.com/in ("special education teacher" OR "intervention specialist") "iep" "columbus" -jobs -recruiter

10. Public resumes with classroom experience — Google X-ray, filetype search
filetype:pdf "teacher" resume ("teaching certificate" OR "certified") "classroom management" -template -sample -tutor

What Indeed, LinkedIn and Google actually support

Indeed's Smart Sourcing guide shows AND, OR, NOT and quotes, a skill: field for the skills section, and fieldofstudy: and school: for the education section, as of October 2026. The education fields suit teacher searches, because a degree in education or the subject is often the clearest sign of a classroom track.

LinkedIn's Boolean help page requires capital AND, OR and NOT, supports quotes and parentheses, and does not support wildcards, so "math" and "mathematics" must both be written. Google's search operators page documents quotes, site:, the minus sign and filetype:, but not OR; check whether the OR block in an X-ray changes anything.

Education job boards are mostly posting sites. EdJoin, for example, is run by the California County Superintendents Educational Services Association and is built for job postings. Treat boards like it as an applicant source, not a searchable resume database, unless the board's own help pages say otherwise.

Narrowing by calendar, subject shortage and district type

The school calendar shapes every teacher search. Many experienced teachers move between contracts at the end of a school year, so a search in October finds mostly people between jobs, career changers and teachers willing to break a contract. Tell the client what the pool looks like at that time of year before running the first string.

Subject shortages change how strict the string can be. For hard-to-fill subjects such as special education, math, science and bilingual roles, drop the certification block in a second pass and search for subject experience and alternative-route terms, then ask the client what pathway its state offers. For district type, add a block such as ("charter school" OR "public school" OR "private school") only when the client has a strong preference; teachers move between them often.

False positives worth excluding with NOT

• Tutors and test prep instructors. "Tutor," "test prep" and "learning center" profiles teach the same subjects outside a classroom.
• Teaching assistants and paraprofessionals. "Teaching assistant," "paraprofessional" and "aide" profiles are in classrooms but not as the teacher of record. Keep them when the client supports aides becoming teachers.
• Teaching abroad and online English. "TEFL," "teach abroad" and "online English" profiles mention ESL without U.S. certification.
• Fitness, music and arts teachers outside schools. "Yoga," "studio" and "private lessons" profiles say teacher. Exclude them unless the role is in that subject.
• Higher education. "Adjunct," "professor" and "lecturer" profiles teach but usually lack K-12 certification.
• Substitutes, sometimes. Substitute teachers can be excellent hires, but not every substitute is certified. See the substitute teacher screening questions for that role.

A worked example: three passes on a special education search

An invented search, shown as it actually gets narrowed.

The phrase "case manager" helped more than expected: special education teachers who manage IEP caseloads often write it, and aides rarely do.

What a search cannot verify

A string can find someone whose resume lists the right subject, level and certification. It cannot confirm the certificate covers the client's grades and subject, show how they run a classroom, or tell you whether they can start mid-year. The special education teacher screening questions and the interview guide for teachers test that, and the 30-60-90 day plan for teachers helps the school set expectations once the hire is made.