Perhaps you should try some spelling variations:
"proceso control estadisticas datos." » "proceso control estadistica datos.", "proceso control estadistico datos.", "proceso control statistical datos.", "proceso control estadistica casos.", "proceso control estadisticas metodos.", "proceso control estadisticas de.", "process control estadisticas datos.", "proceso contra estadisticas datos.", "proceso contralos estadisticas datos."
"procesal control statistics methods." » "procesal control statistical methods.", "procesal control estadistico methods.", "procesal control estadistica methods.", "procesal control statistics methodology.", "process control statistics methods.", "social control statistics methods.", "proceso contra 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: (("procesal control statistics methods.") OR ("proceso control estadisticas datos."))~.
• Removing quotes may allow a broader search: (( procesal control statistics methods. ) or ( proceso control estadisticas datos. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesal control statistics methods.") or ("proceso control estadisticas datos."))*.