Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"serie studias urbanos." » "serie estudios urbanos.", "serie studia urbanos.", "serie estudio urbanos."
"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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie studias urbanos.") OR ("serie guias urbanos."))) OR ("series estudios urbano."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"serie studias urbanos.\") OR (\"serie guias urbanos.\"))) or (\"series estudios urbano.\"))~".
• Removing quotes may allow a broader search: (((( serie studias urbanos. ) OR ( serie guias urbanos. ))) or ( series estudios urbano. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie studias urbanos.") OR ("serie guias urbanos."))) or ("series estudios urbano."))*.