Perhaps you should try some spelling variations:
curious conversations » curious conversion, courageous conversations, conscious conversations
serious conversation » serious conideration, versus conversation, ingenious conversation
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2.2 18th » 2021 18th, 2022 18th, 2023 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) OR (serious conversation)) %21 germany %ref history %2.2 18th century%22".
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