Perhaps you should try some spelling variations:
"proceso control estadistica methods." » "proceso control estadistico methods.", "proceso control statistical methods.", "proceso economia estadistica methods.", "proceso control estadisticas metodos.", "proceso control estadisticas medicas.", "proceso contra estadistica methods.", "proceso contralos estadistica methods.", "proces contre estadistica methods."
"process control statistics data." » "process control statistical data.", "process control estadistico data.", "process century statistics data.", "procesos control statistics data.", "procesal control statistics data."

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 statistics data.") or ("proceso control estadistica methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics data.") OR ("proceso control estadistica methods.")).
• Removing quotes may allow a broader search: (( process control statistics data. ) or ( proceso control estadistica methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistics data.") or ("proceso control estadistica methods."))*.