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