Perhaps you should try some spelling variations:
upon conversations » union conversations, spoken conversations, human conversations
open conversations » agent conversations, roman conversations, content conversations
bief history » brief history, brief hystory, imf history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, imf history

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 (open conversations)) %2.1 germany %((ref history) OR (bief history)) %2.2 ((20th century) OR (18th century))%22.
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (open conversations)) %2.1 germany %((ref history) or (bief history)) %2.2 ((20th century) or (18th century))%22*.