Perhaps you should try some spelling variations:
"series estudioss urbano." » "series estudios urbano.", "serie estudios urbano.", "serie estudio urbano.", "series estudio urbano."
"seis estudios urbano." » "seis estudio urbano.", "seis estudios peruanos.", "seis estudios hispano.", "los estudios urbano.", "dos estudios urbano.", "dios estudios urbano."
"seis estudios urbanos." » "seis estudio urbanos.", "seis estudios peruanoss.", "seis estudios hispanos.", "los estudios urbanos.", "dos estudios urbanos.", "dios estudios urbanos."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("series estudioss urbano.") or ((("seis estudios urbano.") OR ("seis estudios urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudioss urbano.") OR ((("seis estudios urbano.") OR ("seis estudios urbanos."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"series estudioss urbano.\") or (((\"seis estudios urbano.\") OR (\"seis estudios urbanos.\"))))*".
• Removing quotes may allow a broader search: (( series estudioss urbano. ) or ((( seis estudios urbano. ) OR ( seis estudios urbanos. ))))*.