Use each database's thesaurus or subject headings list to identify the best wording for your topic.
Know the proper geographical terms, especially the words that would be used within the country you are studying. For instance, "Middle East" is an American term that may not be used by persons who live in African or Asian. In some databases (such as ProQuest ERIC) you can specify a location in tandem with your search term(s). In Proquest ERIC, for example, this would look like "LOC(Ghana)".
Education terminology may vary according to the location. For instance, in the United Kingdom and in other places that use British terminology, "early years" is often used for "early childhood"; "maths" is often used for "mathematics"; "special educational needs" or "SEN" is often used for "special education"; and "further education" is often used for "lifelong education."