Perhaps you should try some spelling variations:
driven conversations » driven conversational, live conversations, lives conversations
union conversations » win conversations, design conversations, invent conversations
20th century » 18th century
reef history » brief history, reeves history, reef fishery
1918 germany » 8 germany
ref history » brief history, bief history, imf history
21 germany » 2.1 germany, 11 germany, 2 germany
2f germany » 2 germany, 20 germany, 25 germany
2f 20th » 20 20th, 2.2 20th

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: %22christian ((union conversations) OR (driven conversations)) %((2f germany) OR (((21 germany) OR (1918 germany)))) %((reef history) OR (ref history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((union conversations) OR (driven conversations)) %((2f germany) or (((21 germany) or (1918 germany)))) %((reef history) or (ref history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) OR (driven conversations)) %((2f germany) or (((21 germany) or (1918 germany)))) %((reef history) or (ref history)) %2f 20th century%22*.