Searching for phrases is very simple: you put a phrase in quotation marks ("your phrase") and your search is narrowed down to two words together in a phrase.
Research in every academic discipline will sometimes require to search for phrases. Here are some examples in each discipline:
Putting phrases in quotation marks excludes words within the phrase. For example, if I wanted to search for critical race theory and I typed the phrase without quotation marks, I would get articles that mention race, critical, or theory, but not necessarily together as a phrase. There would be some relevant results that discussed critical race theory, but using quotation marks quickly weeds out what I don't need.