Perhaps you should try some spelling variations:
"proces contreles estadistica methods." » "proces control estadistica methods.", "proces hoteles estadistica methods.", "proces control estadistico methods.", "proces contreles estadisticas metodos.", "proces contreles estadisticas medicas.", "proceso contralos estadistica methods.", "proces contre estadistica methods.", "procesos contables estadistica methods."
"process control statistical methods." » "procesos control statistical methods.", "proceso control statistical methods.", "procesal control statistical methods.", "process control statistics methods.", "process control estadisticas methods."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical methods.") OR ("proces contreles estadistica methods."))~.
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