Perhaps you should try some spelling variations:
curious conversations » curious conversion, serious conversation, conscious conversations
reef history » brief history, reeves history
reef fishery » reef fishes, reef fish
20th century » 18th century
imf history » brief history
21 germany » 2.1 germany, 11 germany, 2 germany
2f 20th » 20 20th, 2.2 20th

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