Perhaps you should try some spelling variations:
"proceso control service methodology." » "proceso control science methodology.", "proceso control sciences methodology.", "process control service methodology.", "proceso contra service methodology.", "proceso contralos service methodology.", "proceso control devices methodology."
"procesal control statistical methods." » "process control statistical methods.", "social control statistical methods.", "proceso contra 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 ("proceso control service methodology."))~.
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• Adding a wildcard symbol may retrieve word variants: (("procesal control statistical methods.") or ("proceso control service methodology."))*.