Perhaps you should try some spelling variations:
union conversations » design conversations, driven conversations, invent conversations
win conversations » when conversations, ai conversations, ip conversations
ref history » reef history, bief history, imf history
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 11 germany, 2 germany, 7 germany

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 ((union conversations) OR (win conversations)) %((20 germany) OR (21 germany)) %((ref history) OR (brief history)) %2f 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((union conversations) OR (win conversations)) %((20 germany) or (21 germany)) %((ref history) or (brief history)) %2f 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) OR (win conversations)) %((20 germany) or (21 germany)) %((ref history) or (brief history)) %2f 18th century%22*.