Method A: Look for Subject (thesaurus) terms at the right of a search results page OR at the bottom of a citation.
Method B: Go Directly to the Thesaurus: From the Advanced Search screen in PsycInfo, you can search the Thesaurus (link found above search box). See screenshots below.
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Sample searches on the ProQuest platform
Specific Order (Proximity) Think of P for PRE!
The first term precedes the second term by two or fewer words.
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Any Order (Near)
The terms are within three words apart, in any order.