Perhaps you should try some spelling variations:
when conversations » open conversations, agent conversations, chain conversations
win conversations » ai conversations, ip conversations, iv conversations
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, bief history
11 germany » 11 german, 1918 germany, 7 germany
2020 18th » 2020 16th, 2020 15th, 2020 8th

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 (when conversations)) %((11 germany) OR (2.1 germany)) %ref history %2020 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((win conversations) OR (when conversations)) %((11 germany) or (2.1 germany)) %ref history %2020 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((win conversations) OR (when conversations)) %((11 germany) or (2.1 germany)) %ref history %2020 18th century%22*.