Perhaps you should try some spelling variations:
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos.", "proceso control estadistico methods.", "procesal control estadistico methods."
"procesos penales statistical methods." » "procesos problems statistical methods.", "procesos health statistical methods.", "procesos sciences statistical methods.", "proceso penal statistical methods.", "procesos contables statistical methods.", "procesos sociales statistical 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: (("process control estadistico methods.") OR ("procesos penales statistical methods."))~.
• Removing quotes may allow a broader search: (( process control estadistico methods. ) or ( procesos penales statistical methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("process control estadistico methods.") or ("procesos penales statistical methods."))*.