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