Perhaps you should try some spelling variations:
"procesos sociales estadisticas methods." » "procesos soluciones estadisticas methods.", "procesos chile estadisticas methods.", "procesos espacial estadisticas methods.", "procesos sociales estadisticas metodos.", "procesos sociales estadisticas datos.", "procesos sociales estadisticas medicas."
"proceso control statistical methods." » "process control statistical methods.", "proceso contra statistical methods.", "proceso contralos statistical methods.", "proceso 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: (("proceso control statistical methods.") or ("procesos sociales estadisticas methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("proceso control statistical methods.") OR ("procesos sociales estadisticas methods.")).
• Removing quotes may allow a broader search: (( proceso control statistical methods. ) or ( procesos sociales estadisticas methods. )).
• Adding a wildcard symbol may retrieve word variants: (("proceso control statistical methods.") or ("procesos sociales estadisticas methods."))*.