Perhaps you should try some spelling variations:
"procesos contables statistical methods." » "procesos control statistical methods.", "procesos sociales statistical methods.", "procesos penales statistical methods."
"process control estadisticas methods." » "process control estadistica methods.", "process control estadistico methods.", "process control statistical methods.", "process control estadisticas metodos.", "process control estadisticas datos.", "process control estadisticas medicas."

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 contables statistical methods.") OR ("process control estadisticas methods."))~.
• Removing quotes may allow a broader search: (( procesos contables statistical methods. ) or ( process control estadisticas methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesos contables statistical methods.") or ("process control estadisticas methods."))*.