Perhaps you should try some spelling variations:
unity conversations » union conversations, unit conversions, city conversation
party conversations » late conversations
1918 germany » 8 germany
reef history » brief history, reeves history, reef fishery
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: "%christian ((unity conversations) OR (party conversations)) %1918 germany %reef history %2.2 18th century%22".
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