Phrase search when you want to search for words together in the order in which you've entered them.
Phrase Example: "hearing aids"
"pediatric brain cancer" Search results 16
pediatric AND "brain cancer" Search results 64
pediatric AND brain AND cancer Search results 6544
Truncation allows you to search any ending on a root word.
For example, if your topic uses the word teenagers, then you may also want to search:
The root word is teen.
To truncate and search teen with any ending type: teen*
Use truncation carefully. You may end up with variations that you didn't anticipate and therefore increasing your results with irrelevant records.