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