Perhaps you should try some spelling variations:
upon conversations » union conversations, spoken conversations, human conversations
open conversations » agent conversations, roman conversations, content conversations
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: %christian ((upon conversations) OR (open conversations)) %21 germany %((((ref history) OR (bief history))) OR (brief history)) %2.2 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) or (open conversations)) %21 germany %((((ref history) OR (bief history))) or (brief history)) %2.2 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (open conversations)) %21 germany %((((ref history) OR (bief history))) or (brief history)) %2.2 ((20th century) or (18th century))%22*.