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

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

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