Perhaps you should try some spelling variations:
"problemas contexto linguistics methodology." » "problemas contexto linguistico methodology.", "problemas contextos linguisticos methodology.", "problemas contacto linguistico methodology.", "problemas contextos linguistics methodology.", "problemas concretos linguistics methodology."
"process control sciences methodology." » "process control science methodology.", "process control sciences meteorology.", "process control science ethnology.", "process control civiles methodology.", "process control nociones 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 contexto linguistics methodology.") OR ("process control sciences methodology."))~.
• Removing quotes may allow a broader search: (( problemas contexto linguistics methodology. ) or ( process control sciences methodology. ))~.
• Adding a wildcard symbol may retrieve word variants: (("problemas contexto linguistics methodology.") or ("process control sciences methodology."))*.