Perhaps you should try some spelling variations:
"procesos control statistical methods." » "process control statistical methods.", "proceso contra statistical methods.", "procesos contables statistical methods.", "procesos control statistics methods.", "procesos control estadisticas methods."
"proceso control estadistico con." » "process control estadistico con.", "proceso contra estadistico con.", "proceso contralos estadistico con.", "proceso control estadistica con.", "proceso control estadistico en.", "proceso control estadistico de."

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 statistical methods.") or ("proceso control estadistico con."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos control statistical methods.") OR ("proceso control estadistico con.")).
• Removing quotes may allow a broader search: (( procesos control statistical methods. ) or ( proceso control estadistico con. )).
• Adding a wildcard symbol may retrieve word variants: (("procesos control statistical methods.") or ("proceso control estadistico con."))*.