Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christianity upon » christianity among, christianity along, christianity from
ref history » reef history, brief history, bief history
11 germany » 11 german, 1918 germany, 7 germany

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: %christianity upon conversations %11 germany %ref history %2.2 ((20th century) OR (18th century))%22.
• Adding a wildcard symbol may retrieve word variants: %christianity upon conversations %11 germany %ref history %2.2 ((20th century) or (18th century))%22*.