Perhaps you should try some spelling variations:
"supply based irrigation schemes." » "supply based irrigation scheme.", "supply based irrigation systems.", "supply basin irrigation schemes.", "supply water irrigation schemes.", "supply led irrigation schemes.", "supply case irrigation schemes.", "supplies based irrigation schemes.", "supply asia irrigation schemes."
"supply uhi's irrigation system." » "supply uhi's irrigation systems.", "supply uhi's irrigation water.", "supply uhi's irrigation scheme.", "supply high irrigation system.", "supply uhi's mitigation system.", "supply studies irrigation system.", "supply chain's irrigation system.", "supply chains irrigation system.", "supply china irrigation system."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply based irrigation schemes.") OR ("supply uhi's irrigation system."))~.
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