Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
ref history » reef history, brief history, bief history
20 germany » 2 germany, 7 germany, 8 germany
12 germany » 11 germany, 12 german, 14 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 %((20 germany) OR (12 germany)) %ref history %2f 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((20 germany) or (12 germany)) %ref history %2f 18th century%22*.