Perhaps you should try some spelling variations:
"process control estadistica data." » "process control estadistico data.", "process control statistical data.", "process economia estadistica data.", "process control estadistica para.", "process control estadisticas datos.", "process control estadisticas para."
"procesal control statistics methods." » "procesal control statistical methods.", "procesal control estadistico methods.", "procesal century statistics 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 estadistica data."))~.
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• Removing quotes may allow a broader search: (( procesal control statistics methods. ) OR ( process control estadistica data. )).
• Adding a wildcard symbol may retrieve word variants: (("procesal control statistics methods.") OR ("process control estadistica data."))*.