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."
"serie studias peruanos." » "serie estudios peruanos.", "serie studia peruanos.", "series estudios peruanos."
"serie estudio urbano." » "serie estudios urbano.", "serie estudios urbanos.", "serie espacio urbano.", "series estudios urbano.", "serie studia urbano."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("serie studias peruanos.") or ("leyes estudios hispanicos."))) or ("serie estudio urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie studias peruanos.") OR ("leyes estudios hispanicos."))) OR ("serie estudio urbano.")).
• Removing quotes may allow a broader search: (((( serie studias peruanos. ) or ( leyes estudios hispanicos. ))) or ( serie estudio urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("serie studias peruanos.") or ("leyes estudios hispanicos."))) or ("serie estudio urbano."))*.