Perhaps you should try some spelling variations:
"supply charges irrigation systems." » "supply large irrigation systems.", "supply surge irrigation systems.", "supply channels irrigation systems.", "supply chains irrigation systems.", "supply curves irrigation systems.", "supply charges irrigation system."
"supply change irrigation schemes." » "supply change irrigation scheme.", "supply change mitigation schemes.", "supply canal irrigation schemes.", "supply large irrigation schemes.", "supply channels irrigation schemes.", "supply chain's irrigation schemes.", "supply chain irrigation schemes."

Try widening your search to All Fields.

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