Perhaps you should try some spelling variations:
"tres estudioss urbano." » "tres estudio urbano.", "tres estudios urbano.", "tres estadios urbano.", "otros estudios urbano."
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudio urbano.", "series estudios peruanos.", "series estudios hispano."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos.", "series estudio urbanos.", "series estudios peruanoss.", "series 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: (("tres estudioss urbano.") or ((("series estudios urbano.") OR ("series estudios urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tres estudioss urbano.") OR ((("series estudios urbano.") OR ("series estudios urbanos.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"tres estudioss urbano.\") or (((\"series estudios urbano.\") OR (\"series estudios urbanos.\"))))".
• Removing quotes may allow a broader search: (( tres estudioss urbano. ) or ((( series estudios urbano. ) OR ( series estudios urbanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("tres estudioss urbano.") or ((("series estudios urbano.") OR ("series estudios urbanos."))))*.