Perhaps you should try some spelling variations:
"process control estadisticas datos." » "process control estadistica datos.", "process control estadistico datos.", "process control statistical datos.", "process control estadistica casos.", "process control estadisticas metodos.", "process control estadisticas de."
"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 datos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("proces control statistics methods.") OR ("process control estadisticas datos.")).
• Removing quotes may allow a broader search: (( proces control statistics methods. ) or ( process control estadisticas datos. )).
• Adding a wildcard symbol may retrieve word variants: (("proces control statistics methods.") or ("process control estadisticas datos."))*.