Perhaps you should try some spelling variations:
"supply grid integration theories." » "supply grid integration theory.", "supply grid integration through.", "supply grid integration reforms.", "supply trade integration theories.", "supply _ integration theories.", "supply data integration theories.", "supply crowd integration theories.", "support grid integration theories."
"supply grid integration efforts." » "supply grid international efforts.", "supply grid conservation efforts.", "supply trade integration efforts.", "supply _ integration efforts.", "supply data integration efforts.", "supply crowd integration efforts.", "support grid integration efforts."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply grid integration theories.") OR ("supply grid integration efforts."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply grid integration theories.\") OR (\"supply grid integration efforts.\"))".
• Removing quotes may allow a broader search: (( supply grid integration theories. ) OR ( supply grid integration efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration theories.") OR ("supply grid integration efforts."))*.