Perhaps you should try some spelling variations:
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos."
"procesos state statistics methods." » "procesos state statistical methods.", "procesos state statistics methodology.", "procesos spain statistics methods.", "procesos health statistics methods.", "procesos chile statistics methods.", "procesos serie statistics methods.", "procesos software statistics methods.", "procesos durante 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: (("procesos state statistics methods.") or ("process control estadistico methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos state statistics methods.") OR ("process control estadistico methods.")).
• Removing quotes may allow a broader search: (( procesos state statistics methods. ) or ( process control estadistico methods. )).
• Adding a wildcard symbol may retrieve word variants: (("procesos state statistics methods.") or ("process control estadistico methods."))*.