Perhaps you should try some spelling variations:
"coleccion sciences political _ clase" » "coleccion ciencis political _ clase", "coleccion ciencias political _ clase", "coleccion ciencia political _ clase", "coleccion science political _ clase", "coleccion science politics _ clase", "coleccion sciences biological _ clase"
"coleccion books portugal de clacso" » "coleccion becas portugal de clacso", "coleccion alonso portugal de clacso", "coleccion books portugal e clacso", "coleccion books portugal en clacso", "coleccion books portugal y clacso"

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

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