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 medianas estadisticas methods." » "procesos medidas estadisticas methods.", "procesos espana estadistica methods.", "procesos mexico estadisticas methods.", "procesos medianas estadisticas metodos.", "procesos medianas statistical methods.", "procesos medianas estadisticas datos.", "procesos mediante estadisticas methods.", "procesados mediante estadisticas methods.", "procesos mediaticos estadisticas methods."

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