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 » reeves history, reef fishery, imf history
10th century » 18th century, 20th century, 19th century
21 germany » 11 germany, 2 germany, 20 germany
2013 10th » 2015 10th, 2013 8th

Try widening your search to All Fields.

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 %((brief history) OR (reef history)) %2013 10th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %21 germany %((brief history) or (reef history)) %2013 10th century%22*.