Perhaps you should try some spelling variations:
"proceso control science methodology." » "proceso control sciences meteorology.", "proceso control science anthropology.", "proceso contra science methodology.", "proceso contralos science methodology.", "proces contre science methodology."
"process control statistical methods." » "procesos control statistical methods.", "procesal control statistical methods.", "process control statistics methods.", "process control estadisticas methods."

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

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