Perhaps you should try some spelling variations:
"process control estadisticas methods." » "process control estadistica methods.", "process control estadistico methods.", "process economia estadisticas methods.", "process control estadisticas metodos.", "process control statistical methods.", "process control estadisticas datos.", "procesos control estadisticas methods.", "proceso control estadisticas methods.", "procesal control estadisticas methods."
"proces control statistical datos." » "proces control statistical data.", "proces control estadisticas datos.", "proces control statistical methods.", "proces contre statistical datos.", "proces contreles statistical datos.", "proceso contra statistical datos."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("process control estadisticas methods.") or ("proces control statistical datos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control estadisticas methods.") OR ("proces control statistical datos."))*.
• Removing quotes may allow a broader search: (( process control estadisticas methods. ) or ( proces control statistical datos. ))*.