Perhaps you should try some spelling variations:
"proces estudio estadistica casos." » "proces estudio estadistico casos.", "proces estadistico estadistica casos.", "proces estimacion estadistica casos.", "proces estudio estadistica usos.", "proces estudio estadisticas datos.", "proces estudio estadistica con.", "procesal estudio estadistica casos.", "artes estudio estadistica casos.", "propia estudio estadistica casos."
"process control statistical methods." » "procesos control statistical methods.", "proceso control statistical methods.", "procesal control statistical methods.", "process control statistics methods.", "process control estadisticas methods."

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 statistical methods.") or ("proces estudio estadistica casos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical methods.") OR ("proces estudio estadistica casos.")).
• Removing quotes may allow a broader search: (( process control statistical methods. ) or ( proces estudio estadistica casos. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistical methods.") or ("proces estudio estadistica casos."))*.