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