Perhaps you should try some spelling variations:
"proceso contralos estadisticas datos." » "proceso control estadistica datos.", "proceso control estadistico datos.", "proceso contralos estadistica casos.", "proceso contralos estadisticas metodos.", "proceso contralos estadisticas de.", "proceso contra estadisticas datos.", "proces contreles estadisticas datos.", "procesos contables estadisticas datos."
"process control statistics methods." » "process control statistical methods.", "process control estadistico methods.", "process control estadistica 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.

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