Perhaps you should try some spelling variations:
"leyes estudios urbano." » "leyes estudios urbanos.", "leyes estudio urbano.", "leyes estudios peruanos.", "series estudios urbano.", "los estudios urbano.", "seis estudios urbano."
"serie estudos urbans." » "serie estudios urbanos.", "serie d'estudis urbans.", "serie estudio urbano.", "serie estudios urbans.", "series estudios urbans.", "serie estado 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 ("leyes estudios urbano."))) or ("tres estudios hispano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudos urbans.") OR ("leyes estudios urbano."))) OR ("tres estudios hispano.")).
• Removing quotes may allow a broader search: (((( serie estudos urbans. ) or ( leyes estudios urbano. ))) or ( tres estudios hispano. )).
• Adding a wildcard symbol may retrieve word variants: (((("serie estudos urbans.") or ("leyes estudios urbano."))) or ("tres estudios hispano."))*.