Perhaps you should try some spelling variations:
"proceso penal estadistico methods." » "proceso penal estadisticas metodos.", "proceso penal statistical methods.", "proceso en estadistica methods.", "proceso apendice estadistico methods."
"process control statistics methods." » "process control statistical methods.", "process control estadistico methods.", "process control estadistica methods.", "process control statistics methodology.", "procesos control statistics methods.", "procesal control statistics methods."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("process control statistics methods.") or ("proceso penal estadistico methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics methods.") OR ("proceso penal estadistico methods.")).
• Removing quotes may allow a broader search: (( process control statistics methods. ) or ( proceso penal estadistico methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistics methods.") or ("proceso penal estadistico methods."))*.