Perhaps you should try some spelling variations:
"los estudios cervantinos." » "los estudios mercantiles.", "los estudios criticos.", "los estudios andinos."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos."
"tres estudio urbano." » "tres estudios urbano.", "tres espacio urbano.", "artes estudio urbano.", "breas estudio urbano."

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 ((("tres estudio urbano.") or ("los estudios cervantinos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios urbanos.") OR ((("tres estudio urbano.") OR ("los estudios cervantinos."))))*.
• Removing quotes may allow a broader search: (( series estudios urbanos. ) or ((( tres estudio urbano. ) or ( los estudios cervantinos. ))))*.