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
20th century » 18th century
21 germany » 11 germany, 2 germany, 20 germany
1 german » 3 german, 2 german, 5 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 (open conversations)) %((21 germany) OR (1 german)) %bief history %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) OR (open conversations)) %((21 germany) or (1 german)) %bief history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) OR (open conversations)) %((21 germany) or (1 german)) %bief history %2.2 20th century%22*.