Perhaps you should try some spelling variations:
"procesos control estadistico methods." » "procesos control statistical methods.", "procesos control estadisticas metodos.", "proceso contra estadistico methods.", "procesos contables estadistico methods.", "proceso contralos estadistico methods."
"process control statistics methods." » "process control statistical methods.", "process control estadistica methods.", "process century statistics methods.", "process control statistics methodology.", "proceso 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 ("procesos control estadistico methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics methods.") OR ("procesos control estadistico methods.")).
• Removing quotes may allow a broader search: (( process control statistics methods. ) or ( procesos control estadistico methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistics methods.") or ("procesos control estadistico methods."))*.