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