Perhaps you should try some spelling variations:
design conversations » design considerations, design construction, design consideration
design conclusions » design conclusion
21 germany » 2.1 germany, 11 germany, 2 germany
2f history » 2.1 history, imf history, etf history
2017 18th » 2017 14th, 2017 16th, 2017 4th

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %22christian ((design conversations) OR (design conclusions)) %21 germany %2f history %2017 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian ((design conversations) or (design conclusions)) %21 germany %2f history %2017 18th century%22*.