Perhaps you should try some spelling variations:
"supply crowd integration efforts." » "supply crowd international efforts.", "supply crowd conservation efforts.", "supply grid integration efforts.", "supply trade integration efforts.", "supply chain integration efforts.", "supply growth integration efforts.", "supply cost integration efforts.", "supply how integration efforts."
"supply chain irrigation schemes." » "supply chain irrigation scheme.", "supply chain irrigation systems.", "supply change irrigation schemes.", "supply basin irrigation schemes.", "supply chain integration schemes."

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