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 d'estudis urbans." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudio urbans.", "serie estudos 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie d'estudis urbans.") OR ("serie estudios urbano."))) OR ("dos studies hispanic."))~.
• Removing quotes may allow a broader search: (((( serie d'estudis urbans. ) or ( serie estudios urbano. ))) or ( dos studies hispanic. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie d'estudis urbans.") or ("serie estudios urbano."))) or ("dos studies hispanic."))*.