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.
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.
Any Order (Near)
The terms are within three words apart, in any order.