Perhaps you should try some spelling variations:
"leyes estudios hispanicos." » "leyes estudios historicos.", "leyes estudios hispano.", "leyes estudios islamicos.", "series estudios hispanicos.", "los estudios hispanicos.", "seis estudios hispanicos."
"leyes estudios hispanos." » "leyes estudios hispano.", "leyes estudios espanoles.", "leyes estudios lesbianos.", "series estudios hispanos.", "los estudios hispanos.", "seis estudios hispanos."
"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: (("serie estudios urbano.") or ((("leyes estudios hispanos.") OR ("leyes estudios hispanicos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudios urbano.") OR ((("leyes estudios hispanos.") OR ("leyes estudios hispanicos."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"serie estudios urbano.\") or (((\"leyes estudios hispanos.\") OR (\"leyes estudios hispanicos.\"))))*".
• Removing quotes may allow a broader search: (( serie estudios urbano. ) or ((( leyes estudios hispanos. ) OR ( leyes estudios hispanicos. ))))*.