Perhaps you should try some spelling variations:
"proceso control estadistico methods." » "proceso control estadisticas metodos.", "proceso control statistical methods.", "process control estadistico methods.", "proceso contra estadistico methods.", "proceso contralos estadistico methods."
"procesal control statistics methods." » "procesal control statistical methods.", "procesal control estadistica methods.", "procesal century statistics 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.

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