Perhaps you should try some spelling variations:
"process century statistics methodology." » "process century semiotics methodology.", "process century linguistics methodology.", "procesos century statistics methodology.", "procesal century statistics methodology."
"proceso control statistical methods." » "process control statistical methods.", "proceso contra statistical methods.", "proceso contralos statistical methods.", "proceso control estadisticas methods."

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