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, 20 germany, 7 germany
2 germany » 7 germany, 2 german, 8 germany
2.2 18th » 2021 18th, 2022 18th, 2023 18th
2021 6th » 2021 7th

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) OR (2 germany)) %ref history %((2.2 18th) OR (2021 6th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian curious conversations %((21 germany) OR (2 germany)) %ref history %((2.2 18th) or (2021 6th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian curious conversations %((21 germany) OR (2 germany)) %ref history %((2.2 18th) or (2021 6th)) century%22*.