Perhaps you should try some spelling variations:
"theology, doctrinal / history / 17th century" » "theology, doctrinal / history / 18th century", "theology, doctrinal / history / 20th century"
"geology, doctrinal / history / 19th century" » "geology, doctrinal / history / 18th century", "geology, doctrinal / history / 20th century"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("theology, doctrinal / history / 17th century") OR ("geology, doctrinal / history / 19th century")).
• Removing quotes may allow a broader search: (( theology, doctrinal / history / 17th century ) or ( geology, doctrinal / history / 19th century )).
• Adding a wildcard symbol may retrieve word variants: (("theology, doctrinal / history / 17th century") or ("geology, doctrinal / history / 19th century"))*.