Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christianity upon » christianity among, christianity along, christianity from
bief history » brief history, brief hystory, imf history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, imf history

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %christianity upon conversations %2.1 germany %((ref history) OR (bief history)) %2020 ((20th century) OR (18th century))%22.
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