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