Perhaps you should try some spelling variations:
open conversations » roman conversations, content conversations, based conversations
20th century » 18th century
21 germany » 11 germany, 2 germany, 20 germany
2.2 20th » 2020 20th, 2023 20th, 2021 20th
agent » agents

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