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