Perhaps you should try some spelling variations:
"procesos chile estadisticas methods." » "procesos chile estadisticas metodos.", "procesos chile estadisticas datos.", "procesos chile estadisticas medicas.", "procesos chile statistics methods.", "procesos ice estadisticas methods.", "procesos de estadisticas methods.", "procesos civiles estadisticas methods."
"process control statistical methods." » "proceso control statistical methods.", "procesal control statistical methods.", "process control statistics methods."

Try widening your search to All Fields.

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