Perhaps you should try some spelling variations:
"proceso control statistical methodology." » "proceso control statistics methodology.", "proceso control statistical methods.", "proceso contra statistical methodology.", "proceso contralos statistical methodology.", "proces contre statistical methodology."
"process control based methodology." » "process control values methodology.", "process control law methodology.", "process control proposed methodology.", "process control basado methodology.", "process control case methodology.", "process control basico methodology."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("proceso control statistical methodology.") OR ("process control based methodology."))~.
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