Perhaps you should try some spelling variations:
union conversations » win conversations, curious conversations, design conversations
design conclusions » design conclusion
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 2 germany
2f history » imf history, etf history, tnf history

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