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