Perhaps you should try some spelling variations:
design conclusions » design conclusion
2017 germany » 20 germany, 17 germany, 2006 germany
20th century » 18th century
2f history » 2.1 history, imf history, etf history
2f 20th » 20 20th, 2.2 20th

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 conclusions) OR (design considerations)) %2017 germany %2f history %2f 20th century%22.
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