Perhaps you should try some spelling variations:
"procesos contables statistical methods." » "procesos control statistical methods.", "procesos sociales statistical methods.", "procesos penales statistical methods."
"process control estadisticas datos." » "process control estadistica datos.", "process control estadistico datos.", "process control statistical datos.", "process control estadistica casos.", "process control estadisticas metodos.", "process control estadisticas de.", "proceso control estadisticas datos.", "procesal control estadisticas datos."

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