As you generate search terms, it will be helpful to prepare a list that includes keywords (important words or phrases) and subject headings (which are like pre-assigned tags for articles). You can find inspiration for keywords within the text of an article, book, etc. You can find examples of subject headings while browsing search results in a periodical database.
These short video tutorials provide strategies for generating search terms, broadening & narrowing search terms, and using search terms together for advanced searching.