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