Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
upon conversations » open conversations, spoken conversations, human conversations
brief hystory » brief history, brief herstory, brief story
20th century » 18th century
bief history » brief history, imf history, reef history
ref history » reef history, brief history, imf history
tnf history » imf history, motif history, stone history
etf history » reef history, imf history, beruf history
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
21 germany » 11 germany, 2 germany, 20 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) OR (union conversations)) %((21 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) OR (union conversations)) %((21 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) OR (union conversations)) %((21 germany) or (2.1 germany)) %((((((etf history) or (tnf history))) or (ref history))) or (((bief history) or (brief hystory)))) %20 20th century%22*.