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 » 11 germany, 20 germany, _ germany
2 germany » _ germany, 7 germany, 8 germany
2 german » _ german, 3 german, 5 german

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 (((2 germany) OR (2 german)))) %((ref history) OR (reef history)) %2023 ((20th century) OR (18th century))%22*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((21 germany) or (((2 germany) OR (2 german)))) %((ref history) or (reef history)) %2023 ((20th century) or (18th century))%22*".