Perhaps you should try some spelling variations:
design conversations » design considerations, design construction, design consideration
design conclusions » design conclusion
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, tnf history
20 20th » 2019 20th, 2020 20th, 2023 20th
90 20th » 94 20th, 1990 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 ((design conversations) OR (design conclusions)) %21 germany %((2f history) OR (ref history)) %((20 20th) OR (90 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) OR (90 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((design conversations) or (design conclusions)) %21 germany %((2f history) or (ref history)) %((20 20th) OR (90 20th)) century%22*.