Perhaps you should try some spelling variations:
"proceso control values methodology." » "proceso control based methodology.", "proceso control policies methodology.", "proceso contra values methodology.", "proceso contralos values methodology.", "proces contre values methodology.", "proceso control andes methodology.", "proceso control cafes methodology."
"process control statistical methods." » "procesos control statistical methods.", "procesal control statistical methods.", "process control statistics methods.", "process control estadisticas methods."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("process control statistical methods.") or ("proceso control values methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical methods.") OR ("proceso control values methodology."))*.
• Removing quotes may allow a broader search: (( process control statistical methods. ) or ( proceso control values methodology. ))*.