Perhaps you should try some spelling variations:
"supply chain integration theories." » "supply chain integration theorems.", "supply chain integrationstheorie 2.", "supply chain integration theory."
"supply crowd integrating services." » "supply crowd integration services.", "supply crowd integrated services.", "supply crowd regulating services.", "supply from integrating services.", "supply now integrating services.", "supply toward integrating services.", "supply growth integrating services.", "supply cost integrating services."

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 chain integration theories.") OR ("supply crowd integrating services."))~.
• Removing quotes may allow a broader search: (( supply chain integration theories. ) or ( supply crowd integrating services. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply chain integration theories.") or ("supply crowd integrating services."))*.