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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade irrigation schemes.") OR ("Supply spate irrigation scheme."))~.
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