Perhaps you should try some spelling variations:
"problemas internos statistics methodology." » "problemas internos semiotics methodology.", "problemas internos linguistics methodology.", "problemas internosen statistics methodology.", "problemas contextos statistics methodology.", "procesos internos statistics methodology."
"proceso control service methodology." » "proceso control science methodology.", "proceso control sciences methodology.", "process control service methodology.", "proceso contra service methodology.", "proceso contralos service methodology.", "proceso control devices 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: (("proceso control service methodology.") OR ("problemas internos statistics methodology."))~.
• Removing quotes may allow a broader search: (( proceso control service methodology. ) or ( problemas internos statistics methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("proceso control service methodology.") or ("problemas internos statistics methodology."))*.