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