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