Perhaps you should try some spelling variations:
"supply grid integration schemes." » "supply grid integration some.", "supply grid integration theories.", "supply trade integration schemes.", "supply _ integration schemes.", "supply data integration schemes.", "supply crowd integration schemes.", "support grid integration schemes."
"supply furrow irrigation schemes." » "supply furrow irrigation scheme.", "supply furrow irrigation systems.", "supply farm irrigation schemes.", "supply crop irrigation schemes.", "supply flood irrigation schemes."

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