Perhaps you should try some spelling variations:
"proceso contra estadistico methods." » "proceso contra estadisticas metodos.", "proceso control estadistico methods.", "proceso control estadistica methods.", "proceso cultura estadistica methods.", "process control estadistico methods."
"procesos control statistical methods." » "process control statistical methods.", "procesos contables statistical methods.", "proceso contralos statistical methods.", "procesos control statistics methods.", "procesos control estadisticas methods."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("proceso contra estadistico methods.") OR ("procesos control statistical methods."))~.
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• Adding a wildcard symbol may retrieve word variants: (("proceso contra estadistico methods.") or ("procesos control statistical methods."))*.