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