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."
"problemas contextos linguistics methodology." » "problemas contextos linguisticos methodology.", "problemas contexto linguistico methodology.", "problemas contacto linguistico methodology.", "problemas concretos linguistics methodology.", "problemas candentes linguistics methodology.", "problemas internos linguistics 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 ("problemas contextos linguistics methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("proceso control statistical methodology.") OR ("problemas contextos linguistics methodology.")).
• Removing quotes may allow a broader search: (( proceso control statistical methodology. ) or ( problemas contextos linguistics methodology. )).
• Adding a wildcard symbol may retrieve word variants: (("proceso control statistical methodology.") or ("problemas contextos linguistics methodology."))*.