Can Muslim Men Get Married Twice?

Yes because they go by there religion not by the laws of whatever province they live in. There religion allows that the women will be married to the man and his brothers and if he decides for some reason that he is not happy with her then he can marry again.

Yes according to their law, they can get married thrice.

Yes, they can marry multiple times. But, he should need to take permission from his other wives.