Perhaps you should try some spelling variations:
"supply chain's irrigation scheme." » "supply change irrigation scheme.", "supply canal irrigation scheme.", "supply grain irrigation scheme.", "supply chain's irrigation systems.", "supply channels irrigation scheme.", "supply china irrigation scheme.", "supply chai irrigation scheme."
"supply chains information systems." » "supply chain information systems.", "supply changing information systems.", "supply channels information systems.", "supply chains information 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 chain's irrigation scheme.") or ("supply chains information systems."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain's irrigation scheme.") OR ("supply chains information systems."))*.
• Removing quotes may allow a broader search: (( supply chain's irrigation scheme. ) or ( supply chains information systems. ))*.