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