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