Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
20th century » 18th century
2017 germany » 20 germany, 2006 germany, 21 germany
2.1 germany » 21 germany, 9.13 germany, 9.14 germany
imf history » brief history
2f history » etf history, ref history, tnf history
17 germany » 7 germany, 12 germany, 14 germany
11 germany » 11 german, 1918 germany, 7 germany
2f 20th » 20 20th, 2.2 20th

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 %((11 germany) OR (((2.1 germany) OR (((2017 germany) OR (17 germany)))))) %((2f history) OR (imf history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((11 germany) or (((2.1 germany) or (((2017 germany) OR (17 germany)))))) %((2f history) or (imf history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((11 germany) or (((2.1 germany) or (((2017 germany) OR (17 germany)))))) %((2f history) or (imf history)) %2f 20th century%22*.