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