Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
design conclusions » design conclusion
2f history » 2.1 history, imf history, etf history
2 germany » 12 germany, 7 germany, 2 german
2017 18th » 2017 14th, 2017 16th, 2017 4th

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)) %2 germany %2f history %2017 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) or (design conclusions)) %2 germany %2f history %2017 18th century%22*.