Perhaps you should try some spelling variations:
"series estudios urbanos." » "serie estudios urbanos.", "tres estudios urbanos.", "leyes estudios urbanos.", "series estudios peruanoss.", "series estudios hispanos.", "series d'estudis urbanss."
"seis estudios urbano." » "seis estudios peruanos.", "seis estudios hispano.", "seis d'estudis urbans.", "los estudios urbano.", "dos estudios urbano.", "dios estudios urbano."
"eees estudio urbano." » "eees espacio urbano.", "leyes estudio urbano.", "redes estudio urbano.", "leyes estudios urbano."

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: (("series estudios urbanos.") or ((("seis estudios urbano.") or ("eees estudio urbano."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios urbanos.") OR ((("seis estudios urbano.") OR ("eees estudio urbano.")))).
• Removing quotes may allow a broader search: (( series estudios urbanos. ) or ((( seis estudios urbano. ) or ( eees estudio urbano. )))).
• Adding a wildcard symbol may retrieve word variants: (("series estudios urbanos.") or ((("seis estudios urbano.") or ("eees estudio urbano."))))*.