Perhaps you should try some spelling variations:
win conversations » when conversations, ai conversations, wine conversation
20th century » 18th century
2.1 germany » 21 germany, 2017 germany, 9.13 germany
11 germany » 11 german, 1918 germany, 8 germany
2f history » 2.1 history, imf history, etf history
2f 20th » 20 20th, 2.2 20th

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 ((win conversations) OR (((design conclusions) OR (design conclusion)))) %((((7 germany) OR (11 germany))) OR (2.1 germany)) %2f history %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((win conversations) or (((design conclusions) OR (design conclusion)))) %((((7 germany) or (11 germany))) or (2.1 germany)) %2f history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((win conversations) or (((design conclusions) OR (design conclusion)))) %((((7 germany) or (11 germany))) or (2.1 germany)) %2f history %2f 20th century%22*.