Perhaps you should try some spelling variations:
"support grid integration theories." » "support grid integration theorems.", "support grid integrationstheorie 2.", "support grid integration theory.", "support agri integration theories.", "support grant integration theories.", "support group integration theories."
"supply chain international cooperation." » "supply chains international cooperation.", "supply main international cooperation.", "supply can international cooperation."

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 international cooperation.") OR ("support grid integration theories."))~.
• Removing quotes may allow a broader search: (( supply chain international cooperation. ) or ( support grid integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply chain international cooperation.") or ("support grid integration theories."))*.