Perhaps you should try some spelling variations:
curious conversations » curious conversion, courageous conversations, conscious conversations
serious conversation » serious conideration, versus conversation, ingenious conversation
win conversations » when conversations, ai conversations, wine conversation
20th century » 18th century
bief history » brief history, brief hystory, brief herstory
reef history » brief history, reeves history, reef fishery
ref history » brief history, tnf history, reform history
imf history » brief history
etf history » tnf history, beruf history, ethis history
2f germany » 2 germany, 20 germany, 21 germany
2f 20th » 20 20th, 2.2 20th

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