Perhaps you should try some spelling variations:
"supply chain irrigation schemes." » "supply chain irrigation scheme.", "supply chain irrigation systems.", "supply grain irrigation schemes.", "supply change irrigation schemes.", "supply basin irrigation schemes."
"suppliers annual irrigation schemes." » "suppliers annual irrigation scheme.", "suppliers annual irrigation systems.", "suppliers canal irrigation schemes.", "suppliers annual variation schemes.", "suppliers annual inflation schemes.", "supplies annual irrigation schemes.", "supply annual irrigation schemes."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("supply chain irrigation schemes.") or ("suppliers annual irrigation schemes."))~.
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