The databases simply match the words you enter in the search box. Not all authors use the same language to describe similar topics, so you will need to try a variety of searches.
Examples
Using AND, OR, and NOT with keywords can help broaden or narrow your search.
AND | OR | NOT |
joins dissimilar terms; helps narrow your search Example "child development" AND play |
joins similar terms; helps broaden your search Example “child development” OR "human development" |
excludes terms; helps narrow your search Example college NOT "graduate students" |
Use AND & OR together, as well.
“child development” OR "human development"
AND play
The asterisk * is the most common truncation symbol.
You do have to be careful because you might get unexpected results.
"How Library Stuff Works: How to Choose Keywords" by McMaster Libraries (2:42) is licensed under CC-BY.
"How Library Stuff Works: Boolean Operators (AND, OR, NOT)" by McMaster Libraries (3:43) is licensed under CC-BY.