Perhaps you should try some spelling variations:
"tres estudios hispanic." » "tres estudios hispanicos.", "tres estudios hispano.", "tres studies hispanic.", "otros estudios hispanic.", "los estudios hispanic.", "dos estudios hispanic."
"series estudioss urbano." » "series estudios urbano.", "serie estudios urbano.", "seis estudios urbano.", "series estudios urbanos.", "series estudio urbano."
"serie espacio urbano." » "serie espacio urbanismo.", "serie desafio urbano.", "serie estado urbano.", "serie estudio 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 estudioss urbano.") or ("serie espacio urbano."))) or ("tres estudios hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudioss urbano.") OR ("serie espacio urbano."))) OR ("tres estudios hispanic.")).
• Removing quotes may allow a broader search: (((( series estudioss urbano. ) or ( serie espacio urbano. ))) or ( tres estudios hispanic. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudioss urbano.") or ("serie espacio urbano."))) or ("tres estudios hispanic."))*.