Combine your search terms using Boolean operators to get results.
Boolean operators connect your search words together to either narrow or broaden your results in a database (like PubMed) or search engine (like Google Scholar).
Boolean operators are the words "AND", "OR" and "NOT".
Prefer a video? Watch this Boolean Operators tutorial.
You will use a mix of keyword terms and subject headings (also called MeSH or thesaurus terms, depending on the database). It's a good idea to familiarize yourself with the relevant terms according to your subject and the database.