Perhaps you should try some spelling variations:
"serie estudios urbano." » "serie estudio urbano.", "serie estudios peruanos.", "serie estudios hispano."
"series estudios urbanos." » "series estudio urbanos.", "series estudios peruanoss.", "series estudios hispanos.", "seis estudios urbanos.", "tres estudios urbanos.", "leyes estudios urbanos."
"serie guias urbano." » "serie guia urbana.", "serie aguilar urbano."

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

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