Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
reef history » brief history, reeves history, reef fishery
ref history » brief history, bief history, imf history
21 germany » 2 germany, 20 germany, 7 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 (reef history)) %2023 ((20th century) OR (18th century))%22.
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((21 germany) or (11 germany)) %((ref history) or (reef history)) %2023 ((20th century) or (18th century))%22*.