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