Perhaps you should try some spelling variations:
great conversations » agent conversations, chat conversations, creative conversations
bief history » brief hystory, imf history, reef history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, imf history, etf history
%christianity » %christian

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 great conversations %2.1 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: "%christianity great conversations %2.1 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: %christianity great conversations %2.1 germany %((ref history) or (((bief history) OR (brief history)))) %2.2 ((20th century) or (18th century))%22*.