Perhaps you should try some spelling variations:
gramatica comparado » gramatica comparativa
"gramatica comparada _ general" » "gramatica comparativa _ general"
"Gramática comparado de general" » "Gramática comparativo de general", "Gramática comparacion de general", "Gramática comparado del general", "Gramática comparado de genero", "Gramática comparado de generos"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("Gramática comparado de general") or ("gramatica comparada _ general"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("Gramática comparado de general") OR ("gramatica comparada _ general")).
• Removing quotes may allow a broader search: (( Gramática comparado de general ) or ( gramatica comparada _ general )).
• Adding a wildcard symbol may retrieve word variants: (("Gramática comparado de general") or ("gramatica comparada _ general"))*.