Perhaps you should try some spelling variations:
curious conversations » curious conversion, serious conversation, courageous conversations
reef history » brief history, reeves history, reef fishery
tnf history » imf history, etf history, ref history
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 2.1 germany, 11 germany, 2 germany

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 curious conversations %((20 germany) OR (21 germany)) %((tnf history) OR (reef history)) %2f 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian curious conversations %((20 germany) or (21 germany)) %((tnf history) or (reef history)) %2f 18th century%22*.