Perhaps you should try some spelling variations:
"support grid integration theories." » "support grid integration theory.", "support grid integration through.", "support grid integration reforms.", "support trade integration theories.", "support _ integration theories.", "support data integration theories.", "support agri integration theories.", "support grant integration theories.", "support group integration theories."
"supply grid integration efforts." » "supply grid international efforts.", "supply grid conservation efforts.", "supply trade integration efforts.", "supply _ integration efforts.", "supply data integration efforts.", "supply crowd integration efforts."

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