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
16th century » 19th century, 17th century, 20th century
ref history » reef history, imf history, etf history
21 germany » 2 germany, 20 germany, 1 germany
11 germany » 11 german, 1918 germany, 7 germany

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 (11 germany)) %((ref history) OR (((bief history) OR (brief history)))) %2020 ((16th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((21 germany) or (11 germany)) %((ref history) or (((bief history) or (brief history)))) %2020 ((16th century) OR (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((21 germany) or (11 germany)) %((ref history) or (((bief history) or (brief history)))) %2020 ((16th century) OR (18th century))%22*.