Using Boolean to focus your search
Using punctuation to change results
Truncation means adding a symbol to a word that will change your results. Most of the database help pages will list the truncation symbols that can be applied to a search. These are common symbols in use:
Subject headings
Review the subject headings found in relevant articles from library databases.
Subject headings are official terms that are usually clickable either from the result list or from the full record seen after you click on the source's title. Using these to guide your search helps to focus the results.