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