Perhaps you should try some spelling variations:
"coleccion science political un caso" » "coleccion scientia political un caso", "coleccion ciencia political un caso", "coleccion ciencis political un caso", "coleccion science politica un caso", "coleccion science politicas un caso", "coleccion science politicas una caso"
"coleccion claves portugal e clacso" » "coleccion clacso portugal e clacso", "coleccion casas portugal e clacso", "coleccion clasicos portugal e clacso", "coleccion chaves portugal e clacso", "coleccion class portugal e clacso", "coleccion claves portugal en clacso", "coleccion claves portugal y clacso", "coleccion claves portugal de clacso", "coleccion claves portugal red clacso", "coleccion claves portugal de flacso"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("coleccion claves portugal e clacso") or ("coleccion science political un caso"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("coleccion claves portugal e clacso") OR ("coleccion science political un caso")).
• Removing quotes may allow a broader search: (( coleccion claves portugal e clacso ) or ( coleccion science political un caso )).
• Adding a wildcard symbol may retrieve word variants: (("coleccion claves portugal e clacso") or ("coleccion science political un caso"))*.