Perhaps you should try some spelling variations:
"supply change irrigation schemes." » "supply change irrigation systems.", "supply change mitigation schemes.", "supply canal irrigation schemes.", "supply large irrigation schemes.", "supply change irrigation systemss.", "supply charges irrigation schemes.", "supply channels irrigation schemes.", "supply chain's irrigation schemes."
"supply crowd irrigation scheme." » "supply crowd irrigation systems.", "supply crop irrigation scheme.", "supply flood irrigation scheme.", "supply from irrigation scheme.", "supply growth irrigation scheme.", "supply cost irrigation scheme."

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