Perhaps you should try some spelling variations:
curious conversations » curious conversion, serious conversation, courageous conversations
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2021 18th » 2021 16th, 2021 6th, 2021 7th
2021 13th » 2021 6th, 2021 7th, 2021 5th

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: %22christian curious conversations %21 germany %ref history %((2021 18th) OR (2021 13th)) century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian curious conversations %21 germany %ref history %((2021 18th) or (2021 13th)) century%22*.