Perhaps you should try some spelling variations:
"procesos sociales statistical methods." » "procesos sociology statistical methods.", "procesos sciences statistical methods.", "procesos science statistical methods.", "proceso sociales statistical methods."
"process control estadisticas datos." » "process control estadistica datos.", "process control estadistico datos.", "process control statistical datos.", "process control estadistica casos.", "process control estadisticas metodos.", "process control estadisticas de."

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

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