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.", "series estudioss urbano.", "serie studias urbano.", "serie estados urbano."
"serie estudio urbans." » "serie estudio urbano.", "serie estudios urbanos.", "serie d'estudis urbans.", "series estudios urbans.", "serie studia urbans.", "serie estado 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 estudio urbans.") or ("serie estudios urbano."))) or ("dos estudios hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudio urbans.") OR ("serie estudios urbano."))) OR ("dos estudios hispanic."))*.
• Removing quotes may allow a broader search: (((( serie estudio urbans. ) or ( serie estudios urbano. ))) or ( dos estudios hispanic. ))*.