Perhaps you should try some spelling variations:
curious conversations » curious conversion, courageous conversations, conscious conversations
serious conversation » serious conideration, versus conversation, ingenious conversation
union conversations » win conversations, design conversations, driven conversations
motif history » motion history, motive history, motets history
20th century » 18th century
ref history » reef history, brief history, bief history
tnf history » imf history, stone history, reef history
etf history » reef history, imf history, beruf history
2f germany » 2 germany, 20 germany, 21 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) OR (serious conversation)))) %2f germany %((((etf history) OR (((tnf history) OR (motif history))))) OR (ref history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((union conversations) or (((curious conversations) or (serious conversation)))) %2f germany %((((etf history) or (((tnf history) OR (motif history))))) or (ref history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) or (((curious conversations) or (serious conversation)))) %2f germany %((((etf history) or (((tnf history) OR (motif history))))) or (ref history)) %2f 20th century%22*.