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

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