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