Perhaps you should try some spelling variations:
"process control estadistico methods." » "process control estadisticas metodos.", "process control statistical methods.", "procesos control estadistico methods.", "procesal control estadistico methods."
"proceso control statistical datos." » "proceso control statistical data.", "proceso control estadisticas datos.", "proceso control statistical methods.", "proceso contra statistical datos.", "proceso contralos statistical datos.", "proces contre statistical datos."

You may be able to get more results by adjusting your search query.

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