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