Perhaps you should try some spelling variations:
internacional da » internacional para (Expand Search)
institutos de » instituicoes de (Expand Search)
da pesquisa » de pesquisa (Expand Search), a pesquisa (Expand Search), de pesquisas (Expand Search)
colaboracao » elaboracao (Expand Search)
astronomicas- » astronomica- (Expand Search), astronomicos- (Expand Search), astronomia- (Expand Search)
iac*" » inac*" (Expand Search)

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

• Removing quotes may allow a broader search: ((instituto de) OR (institutos de)) colaboracao internacional da pesquisa astronomicas- iac*.