Perhaps you should try some spelling variations:
design conclusions » design conclusion
win conversations » when conversations, ai conversations, iv conversations
ip conversations » iv conversations, _ conversations, 2 conversations
9.13 germany » 9.14 germany, 9.15 germany, 9.16 germany
20th century » 18th century
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 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 ((((win conversations) OR (ip conversations))) OR (design conclusions)) %((21 germany) OR (9.13 germany)) %ref history %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((((win conversations) OR (ip conversations))) or (design conclusions)) %((21 germany) or (9.13 germany)) %ref history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((((win conversations) OR (ip conversations))) or (design conclusions)) %((21 germany) or (9.13 germany)) %ref history %2f 20th century%22*.