Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"serie estudos urbans." » "serie estudios urbanos.", "serie d'estudis urbans.", "serie estudio urbano.", "serie estudios urbans.", "serie estado urbans.", "serie estudio urbans."
"tres estudios hispano." » "otros estudios hispano.", "los estudios hispano.", "dos estudios hispano.", "tres estudios hispana.", "tres estudios hispanic."

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