Perhaps you should try some spelling variations:
"supply urban integration theories." » "supply urban integration theorems.", "supply urban integrationstheorie 2.", "supply urban integration theory.", "supply european integration theories.", "supply urban migration theories.", "supply chain integration theories."
"supply trip irrigation schemes." » "supply trip irrigation scheme.", "supply trip irrigation systems.", "supply drip irrigation schemes.", "supply crop irrigation schemes.", "supply grain irrigation schemes.", "supply tariff irrigation schemes.", "supply trade irrigation schemes."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply urban integration theories.") OR ("supply trip irrigation schemes."))~.
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