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

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

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