Perhaps you should try some spelling variations:
"series estudios urbano." » "seis estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."
"serie guias urbanos." » "serie parias urbanos.", "serie ruinas urbanas.", "serie buses urbanos."

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

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