Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
upon conversations » union conversations, open conversations, human conversations
20th century » 18th century
ref history » reef history, brief history, bief history
imf history » brief history
2 germany » _ germany, 7 germany, 2 german
2.2 20th » 2020 20th, 2023 20th, 2021 20th

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 ((upon conversations) OR (spoken conversations)) %2 germany %((ref history) OR (imf history)) %2.2 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (spoken conversations)) %2 germany %((ref history) or (imf history)) %2.2 20th century%22*.