Feminist theology isn't just a keyphrase; it is also an established Library of Congress Subject Heading. Click on the images below to see how to run that one LCSH search in both the Library's discovery system and the ATLA Religion Database (where the image reproduced derives from that database's Thesaurus):
Or search by Author (below). For an example, see under Coakley, Sarah.
The New Asceticism by 
Ask the Beasts: Darwin and the God of Love by 