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