Perhaps you should try some spelling variations:
"process control estadistica aspectos." » "process control artistica aspectos.", "process control asistida aspectos.", "process control plastica aspectos.", "process control estadistico aspectos.", "process economia estadistica aspectos."
"procesos control statistical methods." » "proceso contra statistical methods.", "procesos contables statistical methods.", "proceso contralos statistical methods.", "procesos control statistics methods.", "procesos control estadisticas 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 control statistical methods.") OR ("process control estadistica aspectos."))~.
• Removing quotes may allow a broader search: (( procesos control statistical methods. ) or ( process control estadistica aspectos. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesos control statistical methods.") or ("process control estadistica aspectos."))*.