Perhaps you should try some spelling variations:
"dos studies hispanic." » "dos estudios hispanicos.", "dos estudios hispano.", "dos studies spain.", "dos estudios hispanic.", "case studies hispanic."
"series estudios urbans." » "seis estudios urbans.", "tres estudios urbans.", "leyes estudios urbans.", "series estudios urbanos.", "series estudio urbano.", "series d'estudis urbans."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("series estudios urbans.") or ("serie estudios urbano."))) or ("dos studies hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios urbans.") OR ("serie estudios urbano."))) OR ("dos studies hispanic."))*.
• Removing quotes may allow a broader search: (((( series estudios urbans. ) or ( serie estudios urbano. ))) or ( dos studies hispanic. ))*.