Perhaps you should try some spelling variations:
"support trade irrigation schemes." » "support trade irrigation scheme.", "support pradesh irrigation schemes.", "support scale irrigation schemes.", "support gray irrigation schemes.", "support trainer irrigation schemes.", "export trade irrigation schemes.", "import trade irrigation schemes."
"supply grain irrigation systems." » "supply gray irrigation systems.", "supply gravity irrigation systems.", "supply drip irrigation systems.", "supply chain irrigation systems.", "supply main irrigation systems.", "supply ukraine irrigation systems.", "supply grain 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: (("support trade irrigation schemes.") or ("supply grain irrigation systems."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support trade irrigation schemes.") OR ("supply grain irrigation systems.")).
• Removing quotes may allow a broader search: (( support trade irrigation schemes. ) or ( supply grain irrigation systems. )).
• Adding a wildcard symbol may retrieve word variants: (("support trade irrigation schemes.") or ("supply grain irrigation systems."))*.