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