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