Perhaps you should try some spelling variations:
"proceso control estadistica methods." » "proceso control estadisticas metodos.", "proceso control statistical methods.", "proceso control estadisticas medicas.", "proceso control estadistico methods.", "proceso economia estadistica methods.", "process control estadistica methods.", "proceso contra estadistica methods.", "proceso contralos estadistica methods."
"procesos control statistical data." » "process control statistical data.", "proceso contra statistical data.", "procesos contables statistical data.", "procesos control statistics data."

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

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