Perhaps you should try some spelling variations:
"supply chain irrigation schemes." » "supply chain irrigation scheme.", "supply chain irrigation systems.", "supply grain irrigation schemes.", "supply change irrigation schemes.", "supply basin irrigation schemes."
"supply uhi's mitigation system." » "supply uhi's mitigation systems.", "supply uhi's irrigation system.", "supply uhi's navigation system.", "supply uhi mitigation system.", "supply its mitigation system.", "supply crises mitigation system.", "supply chain's mitigation system.", "supply chains mitigation system.", "supply china mitigation 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 irrigation schemes.") or ("supply uhi's mitigation system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain irrigation schemes.") OR ("supply uhi's mitigation system."))*.
• Removing quotes may allow a broader search: (( supply chain irrigation schemes. ) or ( supply uhi's mitigation system. ))*.