Perhaps you should try some spelling variations:
coleccion becas » coleccion ciencias
becas portugal » books portugal, casas portugal
portugal de » portugal en, portal de, portugal _
portugal e » portugal en
portugal y » portugal en
y clase » la clase, de clase, en clase

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( coleccion las ((portugal de) OR (portugal e)) flacso ) or ( coleccion becas portugal y clase ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( coleccion las ((portugal de) OR (portugal e)) flacso ) OR ( coleccion becas portugal y clase )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( coleccion las ((portugal de) OR (portugal e)) flacso ) or ( coleccion becas portugal y clase ))".
• Adding a wildcard symbol may retrieve word variants: (( coleccion las ((portugal de) OR (portugal e)) flacso ) or ( coleccion becas portugal y clase ))*.