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

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

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