Perhaps you should try some spelling variations:
"process control criticism methodology." » "process control critico methodology.", "process athol criticism methodology.", "process carl criticism methodology."
"procesal control statistical methods." » "social control statistical methods.", "proceso contra statistical methods.", "proces contre statistical methods.", "procesal control statistics methods.", "procesal 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: (("procesal control statistical methods.") OR ("process control criticism methodology."))~.
• Removing quotes may allow a broader search: (( procesal control statistical methods. ) or ( process control criticism methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesal control statistical methods.") or ("process control criticism methodology."))*.