Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration through.", "supply trade integration efforts.", "supply trade integration reforms.", "supply side integration theories.", "supply case integration theories."
"supply social integration theory." » "supply global integration theory.", "supply financial integration theory.", "supply regional integration theory.", "supply social integration through.", "supply social information theory.", "supply social integration report."

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 social integration theory."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply trade integration theories.\") OR (\"supply social integration theory.\"))".
• Removing quotes may allow a broader search: (( supply trade integration theories. ) OR ( supply social integration theory. )).
• Adding a wildcard symbol may retrieve word variants: (("supply trade integration theories.") OR ("supply social integration theory."))*.