Perhaps you should try some spelling variations:
"senales estudios urbanos." » "senales estudio urbanos.", "reales estudios urbanos.", "sociales estudios urbanos."
"series estudio urbano." » "series estudios urbano.", "serie estudios urbano.", "senales estudio urbano.", "series espacio urbano."
"serie estudio urbano." » "serie estudios urbano.", "serie espacio urbano.", "series estudios urbano.", "serie studia urbano."

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

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