Perhaps you should try some spelling variations:
institutos de » instituto de (Expand Search), instituicoes de (Expand Search)
da pesquisa » de pesquisa (Expand Search), de pesquisas (Expand Search), em pesquisa (Expand Search)
a pesquisa » de pesquisa (Expand Search), de pesquisas (Expand Search)
colaboracao » elaboracao (Expand Search)
astronomo- » astronomos- (Expand Search), astronomia- (Expand Search)
iac » inac (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "institutos de colaboracao internacional ((a pesquisa) OR (da pesquisa)) astronomo- (iasc OR iac)~".
• Adding a wildcard symbol may retrieve word variants: institutos de colaboracao internacional ((a pesquisa) OR (da pesquisa)) astronomo- (iasc OR iac)*.