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."
"procesal control statistical methods." » "process control statistical methods.", "social control statistical methods.", "proceso contra statistical methods.", "procesal control statistics methods.", "procesal 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: (("procesal control statistical methods.") or ("proceso contralos service methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesal control statistical methods.") OR ("proceso contralos service methodology.")).
• Removing quotes may allow a broader search: (( procesal control statistical methods. ) or ( proceso contralos service methodology. )).
• Adding a wildcard symbol may retrieve word variants: (("procesal control statistical methods.") or ("proceso contralos service methodology."))*.