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