Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theory.", "supply trade integration through.", "supply trade integration efforts.", "supply side integration theories.", "supply case integration theories."
"supply grid integrating policies." » "supply grid international policies.", "supply grid integrating countries.", "supply grid immigration policies.", "supply grid integration policies.", "supply gaps integrating policies.", "supply nigeria integrating policies.", "supply crowd integrating policies.", "support grid integrating policies."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply trade integration theories.") or ("supply grid integrating policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integration theories.") OR ("supply grid integrating policies."))*.
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( supply grid integrating policies. ))*.