Perhaps you should try some spelling variations:
"supply data integration theory." » "supply data integration through.", "supply data information theory.", "supply data integration report.", "supply trade integration theory.", "supply _ integration theory.", "supply data integrity theory.", "supply water integration theory."
"supply drop irrigation system." » "supply drop irrigation systems.", "supply drop irrigation water.", "supply drop irrigation scheme.", "supply drip irrigation system.", "supply crop irrigation system.", "supply from irrigation system.", "supply crowd irrigation system."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply data integration theory.") or ("supply drop irrigation system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply data integration theory.") OR ("supply drop irrigation system."))*.
• Removing quotes may allow a broader search: (( supply data integration theory. ) or ( supply drop irrigation system. ))*.