Perhaps you should try some spelling variations:
"support trade integration theories." » "support trade integration theorems.", "support trade integrationstheorie 2.", "support trade integration theory.", "support trainer integration theories.", "export trade integration theories.", "import trade 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply chain international cooperation.") or ("support trade integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain international cooperation.") OR ("support trade integration theories.")).
• Removing quotes may allow a broader search: (( supply chain international cooperation. ) or ( support trade integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("supply chain international cooperation.") or ("support trade integration theories."))*.