Perhaps you should try some spelling variations:
"supply gap integration theory." » "supply gap integration through.", "supply gap information theory.", "supply gap innovation theory.", "supply erp integration theory.", "supply fsp integration theory.", "supply data integration theory.", "supply a integration theory."
"supply change regulating services." » "supply changes resulting services.", "supply exchange regulations services.", "supply ban regulating services.", "supply charges regulating services.", "supply channels regulating services.", "supply chain's regulating services."

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

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