Perhaps you should try some spelling variations:
"proceso contralos statistical data." » "proceso control statistical data.", "proceso contra statistical data.", "proces contreles statistical data.", "procesos contables statistical data.", "proceso contralos statistics data."
"process control statistics methods." » "process control statistical methods.", "process control estadistico methods.", "process control estadistica methods.", "process control statistics methodology.", "procesos control statistics methods.", "procesal control statistics methods."

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 statistics methods.") or ("proceso contralos statistical data."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics methods.") OR ("proceso contralos statistical data.")).
• Removing quotes may allow a broader search: (( process control statistics methods. ) or ( proceso contralos statistical data. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistics methods.") or ("proceso contralos statistical data."))*.