Perhaps you should try some spelling variations:
"process controllos statistical methods." » "process control statistical methods.", "proceso contralos statistical methods.", "proces contreles statistical methods."
"proceso contra estadisticas datos." » "proceso control estadistica datos.", "proceso economia estadisticas datos.", "proceso control estadistico datos.", "proceso contra estadistica casos.", "proceso contra estadisticas metodos.", "proceso contra estadisticas de.", "process control estadisticas 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 controllos statistical methods.") or ("proceso contra estadisticas datos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process controllos statistical methods.") OR ("proceso contra estadisticas datos.")).
• Removing quotes may allow a broader search: (( process controllos statistical methods. ) or ( proceso contra estadisticas datos. )).
• Adding a wildcard symbol may retrieve word variants: (("process controllos statistical methods.") or ("proceso contra estadisticas datos."))*.