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 » 2017 germany, 9.13 germany, 9.14 germany
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
21 century » 22 century, 21st century, 21th century
2020 21 » 2020 2021, 2020 21st, 2020 2nd

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 ((when conversations) OR (win conversations)) %((21 germany) OR (2.1 germany)) %ref history %2020 21 century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((when conversations) OR (win conversations)) %((21 germany) or (2.1 germany)) %ref history %2020 21 century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((when conversations) OR (win conversations)) %((21 germany) or (2.1 germany)) %ref history %2020 21 century%22*.