Perhaps you should try some spelling variations:
roman conversations » design conversations
open conversations » agent conversations, content conversations, based conversations
20th century » 18th century
bief history » brief history, brief hystory, imf history
reef history » brief history, reeves history, reef fishery
ref history » brief history, imf history, etf history
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
21 germany » 11 germany, 2 germany, 20 germany
2.2 20th » 2020 20th, 2023 20th, 2021 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: %christian ((open conversations) OR (roman conversations)) %((21 germany) OR (2.1 germany)) %((((ref history) OR (reef history))) OR (bief history)) %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((open conversations) or (roman conversations)) %((21 germany) OR (2.1 germany)) %((((ref history) or (reef history))) or (bief history)) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((open conversations) or (roman conversations)) %((21 germany) OR (2.1 germany)) %((((ref history) or (reef history))) or (bief history)) %2.2 20th century%22*.