Perhaps you should try some spelling variations:
"supply chain integration schemes." » "supply chain integration schengen.", "supply chain irrigation schemes.", "supply chain integration regimes."
"Supply trip irrigation systems." » "Supply drip irrigation systems.", "Supply crop irrigation systems.", "Supply grain irrigation systems.", "Supply trip irrigation system."
supply trip » supply tariff, supply trade

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain integration schemes.") OR ("Supply trip irrigation systems."))~.
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