Perhaps you should try some spelling variations:
spoken conversations » open conversations, oboen conversations, taken conversations
spoken conversation » open conversation, sponsor conversation, modern conversation
bief history » brief history, brief hystory, imf history
ref history » reef history, brief history, imf history
21 germany » 11 germany, 2 germany, 20 germany

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 ((spoken conversations) OR (spoken conversation)) %21 germany %((ref history) OR (bief history)) %2020 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((spoken conversations) OR (spoken conversation)) %21 germany %((ref history) or (bief history)) %2020 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((spoken conversations) OR (spoken conversation)) %21 germany %((ref history) or (bief history)) %2020 ((20th century) or (18th century))%22*.