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