Perhaps you should try some spelling variations:
"supply design irrigation system." » "supply design irrigation systems.", "supply design irrigation water.", "supply design irrigation scheme.", "supply basin irrigation system.", "supply deficit irrigation system.", "supply drip irrigation system.", "supplies design irrigation system.", "support design irrigation system.", "supply decisions irrigation system."
"supply flood mitigation scheme." » "supply flood irrigation scheme.", "supply flood irrigation schemes.", "supply flood mitigation systems.", "supply food mitigation scheme.", "supply from mitigation scheme.", "supply crowd 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 design irrigation system.") or ("supply flood mitigation scheme."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply design irrigation system.") OR ("supply flood mitigation scheme."))*.
• Removing quotes may allow a broader search: (( supply design irrigation system. ) or ( supply flood mitigation scheme. ))*.