Perhaps you should try some spelling variations:
"serie estudioss hispanic." » "serie estudios hispanicos.", "serie estudios hispano.", "serie studies hispanic.", "serie estudios hispanic.", "series estudios hispanic.", "serie estudio hispanic."
"serie desafio urbanismo." » "serie espacio urbanismo."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio urbano."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("series estudio urbano.") or ("serie desafio urbanismo."))) or ("serie estudioss hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudio urbano.") OR ("serie desafio urbanismo."))) OR ("serie estudioss hispanic.")).
• Removing quotes may allow a broader search: (((( series estudio urbano. ) or ( serie desafio urbanismo. ))) or ( serie estudioss hispanic. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudio urbano.") or ("serie desafio urbanismo."))) or ("serie estudioss hispanic."))*.