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
tnf history » imf history, etf history, motif history
20 germany » 2 germany, 7 germany, 8 germany
25 germany » 5 germany, 2 germany, 21 germany
2f germany » 2 germany, 21 germany, 26 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 conclusions)) %((((2f germany) OR (25 germany))) OR (20 germany)) %((tnf history) OR (ref history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((design conversations) or (design conclusions)) %((((2f germany) OR (25 germany))) or (20 germany)) %((tnf history) or (ref history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((design conversations) or (design conclusions)) %((((2f germany) OR (25 germany))) or (20 germany)) %((tnf history) or (ref history)) %2f 20th century%22*.