Perhaps you should try some spelling variations:
open conversations » agent conversations, roman conversations, content conversations
upon conversations » union conversations, spoken conversations, human conversations
brief hystory » brief history, brief herstory, brief story
bief history » brief history, brief herstory, brief historic
20th century » 18th century
reef history » brief history, reeves history, reef fishery
etf history » tnf history, beruf history, ethis history
ref history » brief history, tnf history, reform history
imf history » brief history
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 (open conversations)) %21 germany %((((((etf history) OR (reef history))) OR (((ref history) OR (imf 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 (open conversations)) %21 germany %((((((etf history) or (reef history))) or (((ref history) or (imf history))))) or (((bief history) or (brief hystory)))) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) OR (open conversations)) %21 germany %((((((etf history) or (reef history))) or (((ref history) or (imf history))))) or (((bief history) or (brief hystory)))) %20 20th century%22*.