Perhaps you should try some spelling variations:
"process control statistics methods." » "process control statistical methods.", "process control estadistico methods.", "process control estadistica methods.", "process control statistics methodology.", "procesos control statistics methods.", "procesal control statistics methods."
"proceso blas estadisticas metodos." » "proceso las estadisticas metodos.", "proceso tablas estadisticas metodos.", "proceso la estadistica metodos.", "proceso la estadisticas metodos.", "proceso notas estadisticas metodos.", "proceso a estadisticas metodos."

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