Perhaps you should try some spelling variations:
"procesal control statistical methods." » "process control statistical methods.", "social control statistical methods.", "proceso contra statistical methods.", "procesal control statistics methods.", "procesal control estadisticas methods."
"process carl criticism methodology." » "process carlos criticism methodology.", "process paul criticism methodology.", "process carmen criticism methodology.", "proceso caron criticism methodology."

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