Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christianity upon » christianity among, christianity along, christianity from
reef history » brief history, reeves history, reef fishery
tnf history » imf history, etf history, ref history
2 germany » 12 germany, 7 germany, 2 german
11 german » 1 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: %christianity upon conversations %((2 germany) OR (11 german)) %((tnf history) OR (reef history)) %2f 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %christianity upon conversations %((2 germany) or (11 german)) %((tnf history) or (reef history)) %2f 18th century%22*.