Perhaps you should try some spelling variations:
"supply charges irrigation scheme." » "supply change irrigation scheme.", "supply large irrigation scheme.", "supply surge irrigation scheme.", "supply charges irrigation systems.", "supply channels irrigation scheme.", "supply chains irrigation scheme.", "supply curves irrigation scheme."
"supply curve irrigation schemes." » "supply curve irrigation systems.", "supply curve irrigation systemss.", "supply surge irrigation schemes.", "supply large irrigation schemes.", "supply crop irrigation schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply charges irrigation scheme.") or ("supply curve irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply charges irrigation scheme.") OR ("supply curve irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply charges irrigation scheme. ) or ( supply curve irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply charges irrigation scheme.") or ("supply curve irrigation schemes."))*.