Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christians upon » christians among, christians from, christians being
ref history » reef history, brief history, bief history
imf history » brief history
21 germany » 2.1 germany, 11 germany, 2 germany
2.2 18th » 2021 18th, 2022 18th, 2023 18th

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %christians upon conversations %21 germany %((ref history) OR (imf history)) %2.2 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %christians upon conversations %21 germany %((ref history) or (imf history)) %2.2 18th century%22*.