Perhaps you should try some spelling variations:
"problemas internos linguistics methodology." » "problemas contextos linguisticos methodology.", "problemas expertos linguisticos methodology.", "problemas interference linguistics methodology.", "problemas internosen linguistics methodology.", "problemas contextos linguistics methodology.", "procesos internos linguistics methodology."
"process control values methodology." » "process control based methodology.", "process control policies methodology.", "process control andes methodology.", "process control cafes methodology."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("problemas internos linguistics methodology.") or ("process control values methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("problemas internos linguistics methodology.") OR ("process control values methodology.")).
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