Perhaps you should try some spelling variations:
"supply grid integration theory." » "supply grid integration through.", "supply grid information theory.", "supply grid integration report.", "supply trade integration theory.", "supply _ integration theory.", "supply data integration theory.", "supply crowd integration theory.", "support grid integration theory."
"supply crop irrigation schemes." » "supply crop irrigation scheme.", "supply crop irrigation systems.", "supply drip irrigation schemes.", "supply scale irrigation schemes.", "supply canal irrigation schemes.", "supply crowd irrigation schemes.", "supply curve irrigation schemes."

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 theory.") or ("supply crop irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply grid integration theory.") OR ("supply crop irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply grid integration theory. ) or ( supply crop irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply grid integration theory.") or ("supply crop irrigation schemes."))*.