Perhaps you should try some spelling variations:
"supply trade international efforts." » "supply trade international airports.", "supply trade international energy.", "supply trade international airport.", "supply care international efforts.", "supply time international efforts.", "supply private international efforts.", "supply case international efforts."
"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."

Try widening your search to All Fields.

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

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