Perhaps you should try some spelling variations:
"supply chain integration theories." » "supply chain integration theory.", "supply chain integration through.", "supply chain integration efforts.", "supply trade integration theories.", "supply data integration theories."
"support grid integration schemes." » "support grid irrigation schemes.", "support grid integration some.", "support trade integration schemes.", "support _ integration schemes.", "support data integration schemes.", "support agri integration schemes.", "support grant integration schemes.", "support group integration schemes."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain integration theories.") OR ("support grid integration schemes."))~.
• Removing quotes may allow a broader search: (( supply chain integration theories. ) or ( support grid integration schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply chain integration theories.") or ("support grid integration schemes."))*.