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

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

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