Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
upon conversations » open conversations, spoken conversations, human conversations
20th century » 18th century
ref history » reef history, brief history, bief history
imf history » brief history
21 germany » 11 germany, 2 germany, 20 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th

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 ((upon conversations) OR (union conversations)) %21 germany %((ref history) OR (imf history)) %2021 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (union conversations)) %21 germany %((ref history) or (imf history)) %2021 20th century%22*.