Perhaps you should try some spelling variations:
"proceso contra estadisticas methods." » "proceso contra estadisticas metodos.", "proceso contra statistical methods.", "proceso contra estadisticas medicas.", "proceso control estadistica methods.", "proceso economia estadisticas methods.", "proceso control estadistico methods."
"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 control estadisticas datos.", "procesal control estadisticas datos."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("process control estadisticas datos.") or ("proceso contra estadisticas methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control estadisticas datos.") OR ("proceso contra estadisticas methods.")).
• Removing quotes may allow a broader search: (( process control estadisticas datos. ) or ( proceso contra estadisticas methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control estadisticas datos.") or ("proceso contra estadisticas methods."))*.