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

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

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