Perhaps you should try some spelling variations:
"supply payment integration theory." » "supply market integration theory.", "supply payment information theory.", "supply content integration theory.", "supply payment integration through.", "supply payment integration report.", "survey payment integration theory.", "support payments integration theory."
"supply chain integration theory." » "supply chain integration through.", "supply chain information theory.", "supply chain integration report.", "supply trade integration theory.", "supply data integration theory.", "supply grid integration theory."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply chain integration theory.") or ("supply payment integration theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain integration theory.") OR ("supply payment integration theory."))*.
• Removing quotes may allow a broader search: (( supply chain integration theory. ) or ( supply payment integration theory. ))*.