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