Perhaps you should try some spelling variations:
investigaciones cientificas » investigacion cientifica (Expand Search), investigaciones juridicas (Expand Search), investigaciones sociologicas (Expand Search)
politicos comparados » politico comparado (Expand Search), politica comparada (Expand Search), politicos compuestos (Expand Search)
de investigaciones » de investigacion (Expand Search), e investigacion (Expand Search), la investigacion (Expand Search)
consejo superior » ensino superior (Expand Search)
de politicos » de politicas (Expand Search), e politicos (Expand Search), de politico (Expand Search)
superior de » superior del (Expand Search)
unidad de » comunidad de (Expand Search)