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

Try widening your search to All Fields.

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