Perhaps you should try some spelling variations:
"proceso control statistical methodology." » "proceso control statistics methodology.", "proceso control statistical methods.", "process control statistical methodology.", "proceso contra statistical methodology.", "proceso contralos statistical methodology."
"proceso contratos policies methodology." » "proceso contratos values methodology.", "proceso contratos publicos methodology.", "proceso contratos colectivos methodology.", "proceso contrastes politicos methodology.", "proceso contralos policies methodology.", "proceso contra policies methodology.", "process control policies methodology."

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

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