Perhaps you should try some spelling variations:
"supply canal irrigation schemes." » "supply canal irrigation scheme.", "supply canal irrigation systems.", "supply scale irrigation schemes.", "supply canada irrigation schemes.", "supply annual irrigation schemes.", "supply china irrigation schemes."
"supply flood irrigation system." » "supply flood irrigation systems.", "supply flood irrigation water.", "supply flood irrigation scheme.", "supply flood mitigation system.", "supply led irrigation system.", "supply farm irrigation system.", "supply food irrigation system.", "supply from irrigation system.", "supply crowd irrigation 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 flood irrigation system.") or ("supply canal irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply flood irrigation system.") OR ("supply canal irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply flood irrigation system. ) or ( supply canal irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply flood irrigation system.") or ("supply canal irrigation schemes."))*.