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