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