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

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: (("proceso control estadistico methods.") OR ("process control statistical methodology."))~.
• Removing quotes may allow a broader search: (( proceso control estadistico methods. ) or ( process control statistical methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("proceso control estadistico methods.") or ("process control statistical methodology."))*.