Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theory.", "supply trade integration through.", "supply trade integration efforts.", "supply side integration theories.", "supply case integration theories."
"supply grid integration series." » "supply grid integrating services.", "supply grid integration schemes.", "supply grid integration social.", "supply _ integration series.", "supply data integration series.", "supply crowd integration series.", "support grid integration series."

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 grid integration series.") OR ("supply trade integration theories."))~.
• Removing quotes may allow a broader search: (( supply grid integration series. ) or ( supply trade integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration series.") or ("supply trade integration theories."))*.