Perhaps you should try some spelling variations:
"proceso century statistics methodology." » "proceso century semiotics methodology.", "proceso century linguistics methodology.", "proceso contra statistics methodology.", "proceso cultura statistics methodology."
"process control statistical methods." » "procesos control statistical methods.", "procesal control statistical 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 century statistics methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical methods.") OR ("proceso century statistics methodology."))*.
• Removing quotes may allow a broader search: (( process control statistical methods. ) or ( proceso century statistics methodology. ))*.