Perhaps you should try some spelling variations:
"tres estudios hispanicos." » "tres estudios historicos.", "tres estudios hispano.", "tres estudios islamicos.", "otros estudios hispanicos.", "los estudios hispanicos.", "dos estudios hispanicos."
"series estudioss urbano." » "series estudios urbano.", "serie estudios urbano.", "seis estudios urbano.", "series estudios urbanos."
"serie estudio urbano." » "serie estudios urbano.", "serie estudios urbanos.", "serie espacio urbano.", "series estudios urbano.", "serie studia urbano."

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 estudio urbano."))) OR ("tres estudios hispanicos."))~.
• Removing quotes may allow a broader search: (((( series estudioss urbano. ) or ( serie estudio urbano. ))) or ( tres estudios hispanicos. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("series estudioss urbano.") or ("serie estudio urbano."))) or ("tres estudios hispanicos."))*.