Perhaps you should try some spelling variations:
"series estudioss urbano." » "seis estudios urbano.", "serie estudio urbano.", "serie estudos urbano.", "series estudios urbanos.", "series estudio urbano.", "seis estudioss urbano.", "tres estudioss urbano.", "leyes estudioss urbano."
"series estudios hispana." » "series estudios hispano.", "series estudios hispanicos.", "series estudios historia.", "seis estudios hispana.", "tres estudios hispana.", "leyes estudios hispana."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudioss urbano.") OR ("serie estudios urbano."))) OR ("series estudios hispana."))~.
• Removing quotes may allow a broader search: (((( series estudioss urbano. ) or ( serie estudios urbano. ))) or ( series estudios hispana. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("series estudioss urbano.") or ("serie estudios urbano."))) or ("series estudios hispana."))*.