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 de clacso" » "coleccion clacso portugal de clacso", "coleccion casas portugal de clacso", "coleccion clasicos portugal de clacso", "coleccion chaves portugal de clacso", "coleccion class portugal de clacso", "coleccion claves portugal e clacso", "coleccion claves portugal en clacso", "coleccion claves portugal y clacso"

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 de clacso") or ("coleccion science political un caso"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("coleccion claves portugal de clacso") OR ("coleccion science political un caso"))*.
• Removing quotes may allow a broader search: (( coleccion claves portugal de clacso ) or ( coleccion science political un caso ))*.