Perhaps you should try some spelling variations:
"supply american integration theory." » "supply numerical integration theory.", "supply urban integration theory.", "supply american integration through.", "supply american information theory.", "supply american innovation theory.", "supply mexican integration theory.", "supply africa integration theory.", "ugly american integration theory."
"supply china international transport." » "supply iea international transport.", "supply action international transport.", "supply finance international transport.", "supply chains international transport.", "supply chain international transport."

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 american integration theory.") OR ("supply china international transport."))~.
• Removing quotes may allow a broader search: (( supply american integration theory. ) or ( supply china international transport. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply american integration theory.") or ("supply china international transport."))*.