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