Perhaps you should try some spelling variations:
"supply trade integration policies." » "supply trade immigration policies.", "supply trade international policies.", "supply trade migration policies.", "supply case integration policies."
"supply can integration theories." » "supply can integration theorems.", "supply can integrationstheorie 2.", "supply can integration theory.", "supply chain integration theories.", "supply von integration theories.", "supply urban integration theories.", "supply case integration theories.", "supply chai integration theories."

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