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