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 » 2.1 germany, 11 germany, 2 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.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian curious conversations %21 germany %ref history %((2.2 18th) OR (2021 18th)) century%22".
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