Perhaps you should try some spelling variations:
"Supply trade irrigation schemes." » "Supply trade irrigation scheme.", "Supply trade irrigation systems.", "Supply pradesh irrigation schemes.", "Supply scale irrigation schemes.", "Supply grain irrigation schemes."
"Supply spate irrigation schemes." » "Supply spate irrigation scheme.", "Supply spate irrigation systems.", "Supply scale irrigation schemes.", "Supply water irrigation schemes.", "Supply surge irrigation schemes."
supply trade » supply case
supply spate » supply system, supply side, supply water

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Supply trade irrigation schemes.\") OR (\"Supply spate irrigation schemes.\"))~".
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