Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
brief hystory » brief history, brief herstory, brief story
20th century » 18th century
bief history » brief history, imf history, reef history
etf history » reef history, imf history, beruf history
ref history » reef history, brief history, imf history
tnf history » imf history, motif history, stone history
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 11 germany, 2 germany, 25 germany
20 20th » 90 20th, 2019 20th, 2020 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 %((((21 germany) OR (20 germany))) OR (2.1 germany)) %((((((etf history) OR (tnf history))) OR (ref history))) OR (((bief history) OR (brief hystory)))) %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((((21 germany) OR (20 germany))) or (2.1 germany)) %((((((etf history) or (tnf history))) or (ref history))) or (((bief history) or (brief hystory)))) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((((21 germany) OR (20 germany))) or (2.1 germany)) %((((((etf history) or (tnf history))) or (ref history))) or (((bief history) or (brief hystory)))) %20 20th century%22*.