Perhaps you should try some spelling variations:
"process control estadistico metodos." » "process control estadisticas metodos.", "process control estadistica estudios.", "proceso control estadistico metodos.", "procesal control estadistico metodos."
"procesos control statistical methods." » "proceso contra statistical methods.", "procesos contables statistical methods.", "proceso contralos statistical methods.", "procesos control statistics methods.", "procesos control estadisticas methods."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("process control estadistico metodos.") or ("procesos control statistical methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control estadistico metodos.") OR ("procesos control statistical methods.")).
• Removing quotes may allow a broader search: (( process control estadistico metodos. ) or ( procesos control statistical methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control estadistico metodos.") or ("procesos control statistical methods."))*.