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.", "series estudio urbanos.", "series estudios peruanoss.", "series estudios hispanos."
"dos estudios urbano." » "dos estudio urbano.", "dos estudios peruanos.", "dos estudios hispano."

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