Perhaps you should try some spelling variations:
curious conversations » curious conversion, serious conversation, courageous conversations
union conversations » win conversations, design conversations, driven conversations
20th century » 18th century
imf history » brief history
ref history » reef history, brief history, bief history
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
2f history » 2.1 history, etf history, tnf history
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 11 germany, 2 germany, 25 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: %22christian ((union conversations) OR (curious conversations)) %((((21 germany) OR (20 germany))) OR (2.1 germany)) %((((2f history) OR (ref history))) OR (imf history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((union conversations) OR (curious conversations)) %((((21 germany) or (20 germany))) or (2.1 germany)) %((((2f history) or (ref history))) or (imf history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) OR (curious conversations)) %((((21 germany) or (20 germany))) or (2.1 germany)) %((((2f history) or (ref history))) or (imf history)) %2f 20th century%22*.