Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christianity upon » christianity among, christianity along, christianity from
bief history » brief hystory, imf history, reef history
ref history » reef history, imf history, etf history
21 germany » 11 germany, 2 germany, 20 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 %21 germany %((((ref history) OR (brief history))) OR (bief history)) %2020 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christianity upon conversations %21 germany %((((ref history) OR (brief history))) or (bief history)) %2020 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christianity upon conversations %21 germany %((((ref history) OR (brief history))) or (bief history)) %2020 ((20th century) or (18th century))%22*.