Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
bief history » brief hystory, imf history, reef history
20th century » 18th century
ref history » reef history, imf history, etf history
21 germany » 2.1 germany, 11 germany, 2 germany
2020 20th » 2020 16th, 2020 5th, 2020 2021

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