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 values methodology." » "proceso control based methodology.", "proceso control policies methodology.", "process control values methodology.", "proceso contra values methodology.", "proceso contralos values methodology.", "proceso control andes methodology.", "proceso control cafes 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: (("problemas internos statistics methodology.") OR ("proceso control values methodology."))~.
• Removing quotes may allow a broader search: (( problemas internos statistics methodology. ) or ( proceso control values methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("problemas internos statistics methodology.") or ("proceso control values methodology."))*.