Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
design conclusions » design conclusion
20th century » 18th century
21 germany » 2.1 germany, 11 germany, 2 germany
17 germany » 7 germany, 11 germany, 12 germany
2f history » 2.1 history, imf history, etf history
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: %22christian ((union conversations) OR (design conclusions)) %((21 germany) OR (17 germany)) %2f history %2f 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) or (design conclusions)) %((21 germany) or (17 germany)) %2f history %2f 20th century%22*.