Perhaps you should try some spelling variations:
"proceso control estadisticas methods." » "proceso control estadistica methods.", "proceso control estadistico methods.", "proceso economia estadisticas methods.", "proceso control estadisticas metodos.", "proceso control statistical methods.", "proceso control estadisticas datos.", "proceso contra estadisticas methods.", "proceso contralos estadisticas methods.", "proces contre estadisticas methods."
"process control statistical metodos." » "process control statistical methods.", "process control estadisticas metodos.", "procesos control statistical metodos.", "procesal control statistical metodos."

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 statistical metodos.") or ("proceso control estadisticas methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical metodos.") OR ("proceso control estadisticas methods.")).
• Removing quotes may allow a broader search: (( process control statistical metodos. ) or ( proceso control estadisticas methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistical metodos.") or ("proceso control estadisticas methods."))*.