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 data integrating policies." » "supply data international policies.", "supply data integrating countries.", "supply data immigration policies.", "supply data integration policies.", "supply water integrating policies.", "supply gaps 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 data integrating policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integration theories.") OR ("supply data integrating policies.")).
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( supply data integrating policies. )).
• Adding a wildcard symbol may retrieve word variants: (("supply trade integration theories.") or ("supply data integrating policies."))*.