Perhaps you should try some spelling variations:
"serie estudios cervantinos." » "serie estudios mercantiles.", "serie estudios criticos.", "serie estudios andinos."
"series estudios urbano." » "seis estudios urbano.", "leyes estudios urbano.", "sociales estudios urbano.", "series estudio urbano.", "series estudios peruanos.", "series estudios hispano."
"tres estudios urbanos." » "tres estudio urbanos.", "tres estudios peruanoss.", "tres estudios hispanos.", "otros estudios urbanos.", "los estudios urbanos.", "dos estudios urbanos."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("tres estudios urbanos.") or ((("series estudios urbano.") or ("serie estudios cervantinos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tres estudios urbanos.") OR ((("series estudios urbano.") OR ("serie estudios cervantinos."))))*.
• Removing quotes may allow a broader search: (( tres estudios urbanos. ) or ((( series estudios urbano. ) or ( serie estudios cervantinos. ))))*.