Perhaps you should try some spelling variations:
win conversations » when conversations, ai conversations, ip conversations
wine conversation » wide conversation, wins conversation, nine conversations
1918 germany » 8 germany
20th century » 18th century
ref history » reef history, brief history, bief 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 (wine conversation)) %((7 germany) OR (1918 germany)) %ref history %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((win conversations) OR (wine conversation)) %((7 germany) or (1918 germany)) %ref history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((win conversations) OR (wine conversation)) %((7 germany) or (1918 germany)) %ref history %2f 20th century%22*.