Perhaps you should try some spelling variations:
"supply change irrigation schemes." » "supply change irrigation scheme.", "supply change irrigation systems.", "supply change mitigation schemes.", "supply canal irrigation schemes.", "supply large irrigation schemes.", "supply charges irrigation schemes.", "supply channels irrigation schemes.", "supply chain's irrigation schemes."
"supply des internal system." » "supply des internal systems.", "supply its internal system.", "supply des internets system.", "supply 2 internal system.", "supply sides internal system.", "supply gas internal system.", "supply design internal system."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply change irrigation schemes.") OR ("supply des internal system."))~.
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