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