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 can integration schemes." » "supply can integration schengen.", "supply can irrigation schemes.", "supply can integration regimes.", "supply chain integration schemes.", "supply von integration schemes.", "supply urban integration schemes.", "supply case integration schemes.", "supply chai 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: (("supply trade integration theories.") OR ("supply can integration schemes."))~.
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( supply can integration schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply trade integration theories.") or ("supply can integration schemes."))*.