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