Perhaps you should try some spelling variations:
design conclusions » design conclusion
christian design » christian designed, unchristian design, christians designed
20th century » 18th century
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 2 germany
12 germany » 11 germany, 12 german, 14 germany
2023 20th » 2023 26th, 2023 10th, 2020 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: %christian design conclusions %((21 germany) OR (12 germany)) %ref history %2023 20th century%22.
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