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