Perhaps you should try some spelling variations:
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos."
"procesos control statistics methods." » "procesos control statistical methods.", "procesos control estadistica methods.", "procesos century statistics methods.", "procesos control statistics methodology.", "proceso contra statistics methods.", "procesos contables statistics methods.", "proceso contralos 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: (("procesos control statistics methods.") or ("process control estadistico methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos control statistics methods.") OR ("process control estadistico methods."))*.
• Removing quotes may allow a broader search: (( procesos control statistics methods. ) or ( process control estadistico methods. ))*.