Perhaps you should try some spelling variations:
"serie estudios hispanic." » "serie estudios hispanicos.", "serie estudios hispano.", "serie studies hispanic."
"serie espacio urbano." » "serie espacio urbanismo.", "serie desafio urbano.", "serie estado urbano.", "serie estudio urbano."
"serie studies spain." » "serie studia spain.", "series estudios spain.", "media studies spain.", "serie estudies spain.", "serie students spain.", "serie soldiers spain."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie espacio urbano.") or ((("serie studies spain.") or ("serie estudios hispanic."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie espacio urbano.") OR ((("serie studies spain.") OR ("serie estudios hispanic."))))*.
• Removing quotes may allow a broader search: (( serie espacio urbano. ) or ((( serie studies spain. ) or ( serie estudios hispanic. ))))*.