Perhaps you should try some spelling variations:
"case studies hispanic." » "case estudios hispanicos.", "case estudios hispano.", "case studies spain.", "caso studies hispanic.", "base studies hispanic.", "casa studies 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 ("case studies hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudos urbans.") OR ("serie estudios urbano."))) OR ("case studies hispanic."))*.
• Removing quotes may allow a broader search: (((( serie estudos urbans. ) or ( serie estudios urbano. ))) or ( case studies hispanic. ))*.