Perhaps you should try some spelling variations:
design conversations » design considerations, design construction, design consideration
design conclusions » design conclusion
20th century » 18th century
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 2 germany
2f history » imf history, etf history, tnf history
20 20th » 90 20th, 2019 20th, 2020 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 ((design conversations) OR (design conclusions)) %21 germany %((2f history) OR (ref history)) %20 20th century%22*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((design conversations) or (design conclusions)) %21 germany %((2f history) OR (ref history)) %20 20th century%22*".