Perhaps you should try some spelling variations:
"procesos problems statistical methodology." » "procesos problems statistics methodology.", "procesos problems statistical methods.", "procesos process statistical methodology.", "procesos penales statistical methodology."
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("procesos problems statistical methodology.") or ("process control estadistico methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos problems statistical methodology.") OR ("process control estadistico methods."))*.
• Removing quotes may allow a broader search: (( procesos problems statistical methodology. ) or ( process control estadistico methods. ))*.