Perhaps you should try some spelling variations:
"supply surge irrigation schemes." » "supply surge irrigation scheme.", "supply surge irrigation systems.", "supply large irrigation schemes.", "supply surface irrigation schemes.", "supply scale irrigation schemes.", "supply curve irrigation schemes.", "supply sources irrigation schemes.", "supply curves irrigation schemes."
"support group regulating services." » "support about regulating services.", "support group relations services.", "support re regulating services.", "support grant regulating services."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply surge irrigation schemes.") OR ("support group regulating services."))~.
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