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 urban integration series." » "supply urban integrating services.", "supply urban integration schemes.", "supply urban integration social.", "supply european integration series.", "supply global integration series.", "supply urban migration series.", "supply rural integration series."

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