I have a question concerning gusl.We can do ONE gusl for many niyyat right? So, If someone have to make two wajib gusl, and , after finishing his ghusl, he is not sure if he made the niyyat of the second gusl.For example, I do one gusl for gusl hayz and janabat, But after my gusl, I dont remember if I said the niyyat for jannabat.So , my question is, when we do gusl, and we forget to say the niyyat, but , we are aware that we are making this gusl,The ghusl still correct?

The Ghusl is correct inshAllah. If there was an awareness in the heart that she was doing a wajib Ghusl and there was a cause which made it obligatory upon him.