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

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