Perhaps you should try some spelling variations:
"procesos software statistics methods." » "procesos state statistics methods.", "procesos software statistical methods.", "procesos software statistics methodology.", "processing software statistics methods."
"proceso control estadistico methods." » "proceso control statistical methods.", "proceso control estadisticas metodos.", "process control estadistico methods.", "proceso contra estadistico methods.", "proceso contralos estadistico 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 software statistics methods.") OR ("proceso control estadistico methods."))~.
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• Adding a wildcard symbol may retrieve word variants: (("procesos software statistics methods.") or ("proceso control estadistico methods."))*.