Perhaps you should try some spelling variations:
union conversations » design conversations, driven conversations, invent conversations
win conversations » when conversations, ai conversations, ip conversations
reef history » brief history, reeves history, reef fishery
2 germany » 7 germany, 2 german, 8 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 ((union conversations) OR (win conversations)) %2 germany %reef history %2.2 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) OR (win conversations)) %2 germany %reef history %2.2 18th century%22*.