Perhaps you should try some spelling variations:
"proceso contralos statistical methods." » "proceso control statistical methods.", "proceso contra statistical methods.", "proces contreles statistical methods.", "procesos contables statistical methods."
"processing software statistics methods." » "procesos software statistics methods.", "programming software statistics methods.", "processing state statistics methods.", "processing software statistics methodology."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("processing software statistics methods.") OR ("proceso contralos statistical methods."))~.
• Removing quotes may allow a broader search: (( processing software statistics methods. ) or ( proceso contralos statistical methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("processing software statistics methods.") or ("proceso contralos statistical methods."))*.