How you search for things is important - it makes a big difference between getting things that are "maybe/sort of" related to your topic, and things that are 100% on-point.
Use Boolean Keywords (Boolean Keywords = library talk for the words AND / OR / NOT) to make sure you are focusing or expanding your search like you should be, and your results will be way better!
The handy graphic below explains how to properly use your Boolean Operators to maximize your search potential.
Graphic courtesy of María C. Bonet, Electronic Resources Librarian, Prince George's Community College. Used with permission.