Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
reef history » brief history, reeves history, reef fishery
20th century » 18th century
ref history » brief history, bief history, etf history
imf history » brief history
21 germany » 11 germany, 20 germany, 1 germany
2 germany » 7 germany, 2 german, 8 germany
2020 20th » 2020 16th, 2020 2021, 2020 5th

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: %christian upon conversations %((21 germany) OR (2 germany)) %((((ref history) OR (reef history))) OR (imf history)) %2020 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((21 germany) OR (2 germany)) %((((ref history) or (reef history))) or (imf history)) %2020 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((21 germany) OR (2 germany)) %((((ref history) or (reef history))) or (imf history)) %2020 20th century%22*.