Perhaps you should try some spelling variations:
when conversations » open conversations, agent conversations, chain conversations
win conversations » ai conversations, ip conversations, iv conversations
20th century » 18th century
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
21 germany » 11 germany, 2 germany, 7 germany
20 germany » 2 germany, 7 germany, 8 germany
2f history » imf history, etf history, ref 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 ((design considerations) OR (((win conversations) OR (when conversations)))) %((((21 germany) OR (20 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 ((design considerations) or (((win conversations) OR (when conversations)))) %((((21 germany) or (20 germany))) or (2.1 germany)) %2f history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((design considerations) or (((win conversations) OR (when conversations)))) %((((21 germany) or (20 germany))) or (2.1 germany)) %2f history %2f 20th century%22*.