Perhaps you should try some spelling variations:
"proceso control estadistico metodos." » "proceso control estadisticas metodos.", "proceso control estadistica estudios.", "process control estadistico metodos.", "proceso contra estadistico metodos.", "proceso contralos estadistico metodos."
"procesal control statistical methods." » "process control statistical methods.", "social control statistical methods.", "proceso contra statistical methods.", "procesal control statistics methods.", "procesal 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: (("procesal control statistical methods.") or ("proceso control estadistico metodos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesal control statistical methods.") OR ("proceso control estadistico metodos.")).
• Removing quotes may allow a broader search: (( procesal control statistical methods. ) or ( proceso control estadistico metodos. )).
• Adding a wildcard symbol may retrieve word variants: (("procesal control statistical methods.") or ("proceso control estadistico metodos."))*.