Perhaps you should try some spelling variations:
"proceso contra estadistico methods." » "proceso contra estadisticas metodos.", "proceso control estadistico methods.", "proceso control estadistica methods.", "proceso cultura estadistica methods.", "process control estadistico methods."
"procesal control statistical methods." » "process control statistical methods.", "social control statistical methods.", "proces contre statistical methods.", "procesal control statistics methods.", "procesal control estadisticas 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 statistical methods.") OR ("proceso contra estadistico methods."))~.
• Removing quotes may allow a broader search: (( procesal control statistical methods. ) or ( proceso contra estadistico methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesal control statistical methods.") or ("proceso contra estadistico methods."))*.