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