Perhaps you should try some spelling variations:
"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."
"procesos sciences statistical methods." » "procesos ciencias statistical methods.", "procesos sociales statistical methods.", "procesos civiles statistical methods.", "procesos sciences statistics methods."

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: (("procesos sciences statistical methods.") OR ("process control estadisticas datos."))~.
• Removing quotes may allow a broader search: (( procesos sciences statistical methods. ) or ( process control estadisticas datos. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesos sciences statistical methods.") or ("process control estadisticas datos."))*.