Perhaps you should try some spelling variations:
open conversations » roman conversations, content conversations, based conversations
bief history » brief hystory, reef history, brief herstory
20th century » 18th century
ref history » reef history, etf history, tnf history
21 germany » 11 germany, 2 germany, 20 germany
2.2 20th » 2020 20th, 2023 20th, 2021 20th
agent » agents

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 (agent conversations)) %21 germany %((((((ref history) OR (imf history))) OR (bief history))) OR (brief history)) %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((open conversations) or (agent conversations)) %21 germany %((((((ref history) OR (imf history))) or (bief history))) or (brief history)) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((open conversations) or (agent conversations)) %21 germany %((((((ref history) OR (imf history))) or (bief history))) or (brief history)) %2.2 20th century%22*.