Perhaps you should try some spelling variations:
driven conversations » driven conversational, live conversations, lives conversations
union conversations » win conversations, design conversations, invent conversations
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
5 germany » 5 german, 8 germany, 6 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: %22christian ((union conversations) OR (driven conversations)) %((((5 germany) OR (7 germany))) OR (21 germany)) %ref history %2f 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((union conversations) OR (driven conversations)) %((((5 germany) or (7 germany))) or (21 germany)) %ref history %2f 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) OR (driven conversations)) %((((5 germany) or (7 germany))) or (21 germany)) %ref history %2f 18th century%22*.