Perhaps you should try some spelling variations:
curious conversations » serious conversation, courageous conversations, conscious conversations
curious conversion » curious confession, cur's conversion, riots conversion
20th century » 18th century
ref history » reef history, bief history, imf history
12 germany » 11 germany, 12 german, 2 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 ((curious conversion) OR (curious conversations)) %12 germany %((ref history) OR (brief history)) %2f 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian ((curious conversion) or (curious conversations)) %12 germany %((ref history) or (brief history)) %2f 20th century%22*.