I am performing an organization-wide search as an admin.
However, your response was immensely helpful because I then exported and downloaded those results, opened the downloaded results into my Outlook client and using the search tool, I entered the following in both the "Body" and "Subject" fields:
("keyphrase") OR ("keyword1" AND "keyword2"). The search looks like this in the search bar:
contents:( "keypharse" OR "keyword1" AND "keyword2" ) subject:( keypharse" OR "keyword1" AND "keyword2" )
I entered "OR" before "subject" and it seems to have worked.
Thank you!