Perhaps you should try some spelling variations:
"proceso control service methodology." » "proceso control science methodology.", "proceso control sciences methodology.", "proceso contra service methodology.", "proceso contralos service methodology.", "proces contre service methodology.", "proceso control devices methodology."
"process control economics methodology." » "process cultural economics methodology.", "process contextos economicos methodology.", "procesos control economics methodology.", "procesal control economics 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 economics methodology.") OR ("proceso control service methodology."))~.
• Removing quotes may allow a broader search: (( process control economics methodology. ) or ( proceso control service methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("process control economics methodology.") or ("proceso control service methodology."))*.