Perhaps you should try some spelling variations:
"proces contreles statistical methods." » "proces control statistical methods.", "proceso contralos statistical methods.", "proces contre statistical methods.", "process control statistical methods."
"procesos contables statistical datos." » "procesos control statistical datos.", "procesos sociales statistical datos.", "procesos penales statistical datos.", "procesos contables statistical data.", "procesos contables estadisticas datos.", "procesos contables 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: (("proces contreles statistical methods.") or ("procesos contables statistical datos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("proces contreles statistical methods.") OR ("procesos contables statistical datos.")).
• Removing quotes may allow a broader search: (( proces contreles statistical methods. ) or ( procesos contables statistical datos. )).
• Adding a wildcard symbol may retrieve word variants: (("proces contreles statistical methods.") or ("procesos contables statistical datos."))*.