Perhaps you should try some spelling variations:
"series estudios peruanoss." » "series estudios peruanos.", "serie estudios peruanoss.", "seis estudios peruanoss.", "tres estudios peruanoss.", "serie estudioss peruanoss.", "senales estudios peruanoss."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos.", "serie estudioss urbanos.", "senales estudios urbanos."
"series estudio urbano." » "serie estudio urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbano.", "series espacio 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 peruanoss.") or ((("series estudio urbano.") OR ("series estudios urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios peruanoss.") OR ((("series estudio urbano.") OR ("series estudios urbanos.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"series estudios peruanoss.\") or (((\"series estudio urbano.\") OR (\"series estudios urbanos.\"))))".
• Removing quotes may allow a broader search: (( series estudios peruanoss. ) or ((( series estudio urbano. ) OR ( series estudios urbanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("series estudios peruanoss.") or ((("series estudio urbano.") OR ("series estudios urbanos."))))*.