Perhaps you should try some spelling variations:
"supply grid integration theory." » "supply grid integration through.", "supply grid information theory.", "supply grid integration report.", "supply trade integration theory.", "supply _ integration theory.", "supply data integration theory.", "supply crowd integration theory.", "support grid integration theory."
"supply how irrigation schemes." » "supply how irrigation scheme.", "supply how irrigation systems.", "supply crop irrigation schemes.", "supply from irrigation schemes.", "supply high irrigation schemes.", "supply shock irrigation schemes."

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