OJS multi journal site indexing on search engines

I have a big problem. I’m webmaster of https://revistas.reduc.edu.cu/, i have 7 journal alowed in this site, but i can’t find way to put this other journals with the following dns in google search engine:

agrisost.reduc.edu.cu (http://revistas.reduc.edu.cu/index.php/agrisost)
retos.reduc.edu.cu (http://revistas.reduc.edu.cu/index.php/retos)
cienciaydeporte.reduc.edu.cu (http://revistas.reduc.edu.cu/index.php/cienciaydeporte)
monteverdia.reduc.edu.cu (http://revistas.reduc.edu.cu/index.php/monteverdia)
arcada.reduc.edu.cu (http://revistas.reduc.edu.cu/index.php/arcada)
rpa.reduc.edu.cu (http://revistas.reduc.edu.cu/index.php/rpa)
transformacion (http://revistas.reduc.edu.cu/index.php/transformacion)

Somebody… i need help!