Perhaps you should try some spelling variations:
union conversations » win conversations, curious conversations, design conversations
design conclusions » design conclusion
imf history » brief history
etf history » reef history, ref history, tnf history
21 germany » 2.1 germany, 11 germany, 2 germany
2f history » ref history, tnf history, reef history
20 18th » 2017 18th, 2021 18th, 2018 18th

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 (imf history))) OR (etf history)) %20 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 (imf history))) or (etf history)) %20 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) or (design conclusions)) %21 germany %((((2f history) OR (imf history))) or (etf history)) %20 18th century%22*.