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

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 ("serie estudios urbano."))) or ("dos estudios hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudos urbans.") OR ("serie estudios urbano."))) OR ("dos estudios hispanic."))*.
• Removing quotes may allow a broader search: (((( serie estudos urbans. ) or ( serie estudios urbano. ))) or ( dos estudios hispanic. ))*.