Perhaps you should try some spelling variations:
"proceso control estadisticas datos." » "proceso control estadistica datos.", "proceso control estadistico datos.", "proceso economia estadisticas datos.", "proceso control estadistica casos.", "proceso control estadisticas metodos.", "proceso control estadisticas de.", "process control estadisticas datos.", "proceso contra estadisticas datos.", "proceso contralos estadisticas datos."
"proces control statistical methods." » "process control statistical methods.", "proces contre statistical methods.", "proces contreles statistical methods.", "proces control statistics methods."

Try widening your search to All Fields.

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

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