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."
"support agri integration schemes." » "support agri irrigation schemes.", "support agri integration some.", "support grid integration schemes.", "support fare integration schemes.", "support care integration schemes.", "support a integration schemes."

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: (("support agri integration schemes.") OR ("supply trade integration theories."))~.
• Removing quotes may allow a broader search: (( support agri integration schemes. ) or ( supply trade integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support agri integration schemes.") or ("supply trade integration theories."))*.