Perhaps you should try some spelling variations:
open conversations » agent conversations, roman conversations, content conversations
christian open » christian opened, christian open'd, christian popes
motif history » motion history, motive history, motets history
20th century » 18th century
tnf history » etf history, ref history, stone history
2f germany » 2 germany, 20 germany, 25 germany
21 germany » 2.1 germany, 11 germany, 2 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: %christian open conversations %((2f germany) OR (21 germany)) %((((((tnf history) OR (imf history))) OR (motif history))) OR (brief history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian open conversations %((2f germany) OR (21 germany)) %((((((tnf history) or (imf history))) or (motif history))) or (brief history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian open conversations %((2f germany) OR (21 germany)) %((((((tnf history) or (imf history))) or (motif history))) or (brief history)) %2f 20th century%22*.