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 grid integrating services." » "supply grid integration services.", "supply grid integrated services.", "supply grid regulating services.", "supply period integrating services.", "supply world integrating services.", "supply crowd integrating services.", "supply great integrating services.", "support grid integrating 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 trade integration theories.") or ("supply grid integrating services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integration theories.") OR ("supply grid integrating services.")).
• Removing quotes may allow a broader search: (( supply trade integration theories. ) or ( supply grid integrating services. )).
• Adding a wildcard symbol may retrieve word variants: (("supply trade integration theories.") or ("supply grid integrating services."))*.