Perhaps you should try some spelling variations:
"supply functions integration schemes." » "supply transitions integration schemes.", "supply function international schemes.", "supply national integration schemes.", "supply functions irrigation schemes.", "supply functions integration some.", "supply functions integration theories.", "supply function integration schemes.", "supply conditions integration schemes."
"support crop irrigation scheme." » "support crop irrigation systems.", "support drip irrigation scheme.", "support scale irrigation scheme.", "support canal irrigation scheme.", "support crops irrigation scheme.", "support group irrigation scheme.", "support cross irrigation scheme."

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