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

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 peruanoss.") or ((("series estudios urbano.") OR ("serie estudios urbano."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios peruanoss.") OR ((("series estudios urbano.") OR ("serie estudios urbano.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"series estudios peruanoss.\") or (((\"series estudios urbano.\") OR (\"serie estudios urbano.\"))))".
• Removing quotes may allow a broader search: (( series estudios peruanoss. ) or ((( series estudios urbano. ) OR ( serie estudios urbano. )))).
• Adding a wildcard symbol may retrieve word variants: (("series estudios peruanoss.") or ((("series estudios urbano.") OR ("serie estudios urbano."))))*.