Databases use controlled keywords known as thesaurus terms or subject headings or descriptors to categorize each article or record. For example, many library catalogs use Library of Congress subject headings. The thesaurus terms vary for each database according to their indexing system. For example,
You might say "ESL Students"
ERIC uses the subject heading "English Language Learners"
Education Source (EBSCO) uses the term "LIMITED English-proficient students"
If you choose to search multiple databases simultaneously, try using the OR search connector to capture all articles that use the variations of this concept. For example:
"English Language Learners" OR "Limited English-proficient students" OR "ESL Students"
The thesaurus may be labeled Thesaurus, Subjects, or Descriptors depending on the database.