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
ref history » reef history, brief history, imf history
21 germany » 11 germany, 2 germany, 1 germany
20 germany » 2 germany, 7 germany, 8 germany
2020 18th » 2020 16th, 2020 15th, 2020 8th

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)) %((21 germany) OR (20 germany)) %((ref history) OR (bief history)) %2020 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) or (open conversations)) %((21 germany) OR (20 germany)) %((ref history) or (bief history)) %2020 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (open conversations)) %((21 germany) OR (20 germany)) %((ref history) or (bief history)) %2020 18th century%22*.