Perhaps you should try some spelling variations:
when conversations » open conversations, agent conversations, chain conversations
design conclusions » design conclusion
win conversations » ai conversations, ip conversations, iv conversations
9.16 germany » 9.13 germany, 9.14 germany, 9.15 germany
20th century » 18th century
2.1 history » 1.1 history, 601 history
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref 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 ((((win conversations) OR (when conversations))) OR (design conclusions)) %((21 germany) OR (9.16 germany)) %((2f history) OR (2.1 history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((((win conversations) OR (when conversations))) or (design conclusions)) %((21 germany) or (9.16 germany)) %((2f history) or (2.1 history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((((win conversations) OR (when conversations))) or (design conclusions)) %((21 germany) or (9.16 germany)) %((2f history) or (2.1 history)) %2f 20th century%22*.