Perhaps you should try some spelling variations:
curious conversations » serious conversation, courageous conversations, conscious conversations
curious conversion » curious confession, cur's conversion, riots conversion
20th century » 18th century
tnf history » etf history, ref history, motif history
imf history » brief history
21 germany » 2 germany, 20 germany, 7 germany
11 germany » 11 german, 1918 germany, 7 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 ((curious conversations) OR (curious conversion)) %((21 germany) OR (11 germany)) %((tnf history) OR (imf history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((curious conversations) or (curious conversion)) %((21 germany) OR (11 germany)) %((tnf history) or (imf history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((curious conversations) or (curious conversion)) %((21 germany) OR (11 germany)) %((tnf history) or (imf history)) %2f 20th century%22*.