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