Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theorems.", "supply trade integrationstheorie 2.", "supply trade integration theory.", "supply case integration theories."
"supply basin irrigation schemes." » "supply basin irrigation scheme.", "supply basin irrigation systems.", "supply drip irrigation schemes.", "supply canal irrigation schemes.", "supply farm irrigation schemes.", "supply asia irrigation schemes.", "supply based irrigation schemes.", "supply design irrigation 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: (("supply trade integration theories.") OR ("supply basin irrigation schemes."))~.
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( supply basin irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply trade integration theories.") or ("supply basin irrigation schemes."))*.