Perhaps you should try some spelling variations:
"serie estudos peruanos." » "serie estudios peruanos.", "serie estado peruano.", "serie maestros peruanos.", "serie estado peruanos.", "serie estudio peruanos."
"serie studias urbanos." » "serie estudios urbano.", "serie studia urbanos.", "serie estudios urbanos.", "serie guias urbanos."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres 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 studias urbanos.") or ((("series estudios urbanos.") or ("serie estudos peruanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie studias urbanos.") OR ((("series estudios urbanos.") OR ("serie estudos peruanos.")))).
• Removing quotes may allow a broader search: (( serie studias urbanos. ) or ((( series estudios urbanos. ) or ( serie estudos peruanos. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie studias urbanos.") or ((("series estudios urbanos.") or ("serie estudos peruanos."))))*.