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• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture AND state %((7 germany) OR (2.1 germany)) %imf history %((2020 20th) OR (2020 16th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture AND state %((7 germany) OR (2.1 germany)) %imf history %((2020 20th) OR (2020 16th)) century%22*.