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