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