Perhaps you should try some spelling variations:
curious conversations » curious conversion, serious conversation, conscious conversations
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2021 18th » 2021 13th, 2021 16th, 2021 6th
2.2 18th » 2022 18th, 2023 18th, 2012 18th

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