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

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: (("process control service methodology.") OR ("procesos problems statistical methodology."))~.
• Removing quotes may allow a broader search: (( process control service methodology. ) or ( procesos problems statistical methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("process control service methodology.") or ("procesos problems statistical methodology."))*.