Perhaps you should try some spelling variations:
"supply change irrigation system." » "supply change mitigation system.", "supply canal irrigation system.", "supply large irrigation system.", "supply change irrigation systems.", "supply change irrigation water.", "supply change irrigation scheme.", "supply charges irrigation system.", "supply channels irrigation system.", "supply chain's irrigation system."
"supply low mitigation scheme." » "supply low irrigation scheme.", "supply low irrigation schemes.", "supply low mitigation systems.", "supply co2 mitigation scheme.", "supply flood mitigation scheme.", "supply cost mitigation scheme.", "supply law mitigation scheme.", "supply crowd mitigation scheme.", "supply block mitigation scheme."

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

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