Perhaps you should try some spelling variations:
upon conversations » union conversations, spoken conversations, human conversations
open conversations » agent conversations, roman conversations, content conversations
20th century » 18th century
etf history » reef history, imf history, tnf history
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
11 german » 1 german
2.2 20th » 2020 20th, 2023 20th, 2021 20th

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 (11 german)) %((etf history) OR (ref 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 (11 german)) %((etf history) or (ref history)) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) OR (open conversations)) %((21 germany) or (11 german)) %((etf history) or (ref history)) %2.2 20th century%22*.