Perhaps you should try some spelling variations:
"process control statistics methodology." » "process control semiotics methodology.", "process control linguistics methodology.", "process control statistical methodology.", "process control estadistico methodology.", "process control estadistica methodology.", "proceso control statistics methodology.", "procesal control statistics methodology."
"procesos contables estadistica methods." » "procesos control estadistica methods.", "procesos hoteles estadistica methods.", "procesos control estadistico methods.", "procesos contables estadisticas metodos.", "procesos contables statistical methods.", "procesos contables estadisticas medicas.", "procesos sociales estadistica methods.", "procesos penales estadistica methods."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics methodology.") OR ("procesos contables estadistica methods."))~.
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