Perhaps you should try some spelling variations:
"process control service methodology." » "process control science methodology.", "process control sciences methodology.", "process control devices methodology.", "proceso control service methodology.", "procesal control service methodology."
"procesos problems statistical methods." » "procesos process statistical methods.", "procesos penales statistical methods.", "procesos problems statistics methods.", "procesos problems estadisticas methods."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("process control service methodology.") or ("procesos problems statistical methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control service methodology.") OR ("procesos problems statistical methods.")).
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• Adding a wildcard symbol may retrieve word variants: (("process control service methodology.") or ("procesos problems statistical methods."))*.