Perhaps you should try some spelling variations:
"leyes estudios hispanos." » "leyes estudios hispanicos.", "leyes estudios espanoles.", "leyes estudios lesbianos.", "series estudios hispanos.", "los estudios hispanos.", "seis estudios hispanos.", "leyes estudios hispanas.", "leyes estudios hispanics."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."
"leyes estudios hispano." » "series estudios hispano.", "los estudios hispano.", "seis estudios hispano.", "leyes estudios hispana.", "leyes estudios hispanic."

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 hispano."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudios urbano.") OR ((("leyes estudios hispanos.") OR ("leyes estudios hispano."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"serie estudios urbano.\") or (((\"leyes estudios hispanos.\") OR (\"leyes estudios hispano.\"))))*".
• Removing quotes may allow a broader search: (( serie estudios urbano. ) or ((( leyes estudios hispanos. ) OR ( leyes estudios hispano. ))))*.