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
etf history » imf history, ref history, tnf history
11 german » 1 german
2 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 %((2 german) OR (11 german)) %((etf history) OR (reef history)) %2f 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((2 german) or (11 german)) %((etf history) or (reef history)) %2f 18th century%22*.