Perhaps you should try some spelling variations:
open conversations » agent conversations, roman conversations, content conversations
christian open » christian opened, christian open'd, christian popes
bief history » brief hystory, imf history, reef history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
2021 18th » 2021 13th, 2021 16th, 2021 6th
2.2 18th » 2022 18th, 2023 18th, 2012 18th

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: %christian open conversations %2.1 germany %((brief history) OR (bief history)) %((2.2 18th) OR (2021 18th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian open conversations %2.1 germany %((brief history) or (bief history)) %((2.2 18th) OR (2021 18th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian open conversations %2.1 germany %((brief history) or (bief history)) %((2.2 18th) OR (2021 18th)) century%22*.