Perhaps you should try some spelling variations:
"Supply surface irrigation system." » "Supply scale irrigation system.", "Supply surface irrigation systems.", "Supply surface irrigation water.", "Supply surface innovation system."
"supply trade irrigation scheme." » "supply trade irrigation systems.", "supply pradesh irrigation scheme.", "supply scale irrigation scheme.", "supply spate irrigation scheme.", "supply side irrigation scheme.", "supply case irrigation scheme."
supply surface » supply service

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

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