Perhaps you should try some spelling variations:
"coleccion academica virtuales de clacso" » "coleccion academica virtual de clacso"
"coleccion politica portugal de clacso" » "coleccion politicas portugal de clacso", "correccion politica portugal de clacso", "coleccion politeya portugal de clacso", "coleccion politica virtual de clacso", "coleccion polonia portugal de clacso", "coleccion politica portuguesa de clacso", "coleccion politica portugal e clacso", "coleccion politica portugal en clacso", "coleccion politica portugal y clacso"

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: (("coleccion politica portugal de clacso") or ("coleccion academica virtuales de clacso"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("coleccion politica portugal de clacso") OR ("coleccion academica virtuales de clacso")).
• Removing quotes may allow a broader search: (( coleccion politica portugal de clacso ) or ( coleccion academica virtuales de clacso )).
• Adding a wildcard symbol may retrieve word variants: (("coleccion politica portugal de clacso") or ("coleccion academica virtuales de clacso"))*.