Perhaps you should try some spelling variations:
"tres estudios urbano." » "tres estudios urbanos.", "tres estudios peruanos.", "tres estudios hispano.", "otros estudios urbano.", "dos estudios urbano.", "dios estudios urbano."
"los estudios urbano." » "los estudios urbanos.", "los estudios peruanos.", "los estudios hispano."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio 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: (((("tres estudios urbano.") or ("series estudio urbano."))) or ("los estudios urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tres estudios urbano.") OR ("series estudio urbano."))) OR ("los estudios urbano.")).
• Removing quotes may allow a broader search: (((( tres estudios urbano. ) or ( series estudio urbano. ))) or ( los estudios urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("tres estudios urbano.") or ("series estudio urbano."))) or ("los estudios urbano."))*.