Perhaps you should try some spelling variations:
"proceso control policies methodology." » "proceso control values methodology.", "proceso control politico methodology.", "proceso control political methodology.", "proceso cultural policies methodology.", "proceso contra policies methodology.", "proceso contralos policies methodology.", "proces contre policies 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 control policies methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical methods.") OR ("proceso control policies methodology."))*.
• Removing quotes may allow a broader search: (( process control statistical methods. ) or ( proceso control policies methodology. ))*.