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
2012 18th » 2012 12th, 2017 18th, 2012 11th
2021 18th » 2021 13th, 2021 16th, 2021 6th
2.2 18th » 2022 18th, 2023 18th, 2020 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: %22christian curious conversations %21 germany %ref history %((((2.2 18th) OR (2012 18th))) OR (2021 18th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian curious conversations %21 germany %ref history %((((2.2 18th) OR (2012 18th))) or (2021 18th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian curious conversations %21 germany %ref history %((((2.2 18th) OR (2012 18th))) or (2021 18th)) century%22*.