Perhaps you should try some spelling variations:
curious conversations » curious conversion, serious conversation, courageous conversations
design conversations » design considerations, design construction, design conclusions
union conversations » win conversations, driven conversations, invent conversations
20th century » 18th century
reef history » brief history, reeves history, reef fishery
bief history » brief history, brief hystory, ref history
tnf history » etf history, ref history, motif history
imf history » brief history
20 germany » 2 germany, 7 germany, 5 germany
8 germany » 7 germany, 1918 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 (design conversations))) OR (curious conversations)) %((20 germany) OR (8 germany)) %((((imf history) OR (tnf history))) OR (((bief history) OR (reef history)))) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((((union conversations) or (design conversations))) or (curious conversations)) %((20 germany) or (8 germany)) %((((imf history) or (tnf history))) or (((bief history) OR (reef history)))) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((((union conversations) or (design conversations))) or (curious conversations)) %((20 germany) or (8 germany)) %((((imf history) or (tnf history))) or (((bief history) OR (reef history)))) %2f 20th century%22*.