Perhaps you should try some spelling variations:
"series estudioss peruanos." » "series estudios peruanos.", "seis estudios peruanos.", "serie estudos peruanos."
"serie estudio urbano." » "serie estudios urbano.", "serie espacio urbano.", "series estudios urbano.", "serie studia urbano.", "serie estado urbano."
"serie estudios urbanos." » "series estudioss urbanos.", "serie studias urbanos.", "serie estados 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 estudio urbano.") or ("serie estudios urbanos."))) or ("series estudioss peruanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudio urbano.") OR ("serie estudios urbanos."))) OR ("series estudioss peruanos."))*.
• Removing quotes may allow a broader search: (((( serie estudio urbano. ) or ( serie estudios urbanos. ))) or ( series estudioss peruanos. ))*.