Perhaps you should try some spelling variations:
20th century » 18th century
imf history » brief history
20 germany » 2 germany, 7 germany, 8 germany
11 germany » 11 german, 1918 germany, 7 germany
2.2 20th » 2020 20th, 2023 20th, 2021 20th

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• If you are trying to use Boolean operators, they must be ALL CAPS: %22agriculture AND state %((20 germany) OR (11 germany)) %imf history %2.2 20th century%22.
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