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