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 scheme." » "supply urban integration schemes.", "supply urban integration some.", "supply urban irrigation scheme.", "supply european integration scheme.", "supply global integration scheme.", "supply urban migration scheme.", "supply rural integration scheme."

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

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