Perhaps you should try some spelling variations:
"process control estadisticas methods." » "process control estadistica methods.", "process control estadistico methods.", "process control statistical methods.", "process control estadisticas metodos.", "process control estadisticas datos."
"procesos sciences statistics methods." » "procesos sciences statistical methods.", "procesos sciences statistics methodology.", "procesos ciencias statistics methods.", "procesos sociales statistics methods.", "procesos civiles 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 statistics methods.") OR ("process control estadisticas methods."))~.
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• Adding a wildcard symbol may retrieve word variants: (("procesos sciences statistics methods.") or ("process control estadisticas methods."))*.