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

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

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