Perhaps you should try some spelling variations:
"supply social integration theories." » "supply social integration theorems.", "supply social integrationstheorie 2.", "supply social integration theory.", "supply global integration theories.", "supply financial integration theories.", "supply regional integration theories."
"supply border integration social." » "supply border international social.", "supply der integration social.", "supply merger integration social.", "supply border migration social.", "supply order integration social.", "supply under integration social."

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

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