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

Try widening your search to All Fields.

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 urbanos.") or ("serie estudio urbano."))) or ("series estudioss peruanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios urbanos.") OR ("serie estudio urbano."))) OR ("series estudioss peruanos.")).
• Removing quotes may allow a broader search: (((( series estudios urbanos. ) or ( serie estudio urbano. ))) or ( series estudioss peruanos. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios urbanos.") or ("serie estudio urbano."))) or ("series estudioss peruanos."))*.