Perhaps you should try some spelling variations:
"proceso sociales statistical methods." » "proceso sociology statistical methods.", "proceso sciences statistical methods.", "proceso science statistical methods.", "procesos sociales statistical methods.", "proceso social statistical methods.", "procesos locales statistical methods."
"process control statistical datos." » "process control statistical data.", "process control estadisticas datos.", "process control statistics data."

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

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