Perhaps you should try some spelling variations:
union conversations » win conversations, curious conversations, design conversations
upon conversations » open conversations, spoken conversations, human conversations
bief history » brief history, brief hystory, imf history
ref history » reef history, brief history, imf history
21 germany » 2.1 germany, 11 germany, 2 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 (union conversations)) %21 germany %((ref history) OR (bief 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 (union conversations)) %21 germany %((ref history) or (bief history)) %2.2 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) OR (union conversations)) %21 germany %((ref history) or (bief history)) %2.2 ((20th century) or (18th century))%22*.