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 south integration schemes." » "supply south irrigation schemes.", "supply south integration some.", "supply through integration schemes.", "supply social integration schemes.", "supply sector integration schemes.", "supply growth integration schemes.", "supply costs integration schemes.", "supply cost integration schemes."

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 south integration schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integration theories.") OR ("supply south integration schemes."))*.
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( supply south integration schemes. ))*.