how to create view that display just 2 level of taxonomy vocabulary

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You should be just fine by introducing 2 chained parent relationships. Setting the criterion where parent of the parent is NULL should work. Well, this is a purely UI way of doing that, which is a pro. The con is that queries with nested relations might become heavy at some point, therefore consider turning on Views cache when you deploy the site.

It's simple. In fact, there is no need to add any relationship in the Views. Just create the taxonomy term view and add a filter criteria of Taxonomy term: Parent term. (see screenshot) Then set the value to be equal to ''. This will fetch you all the parent terms as they don't have any parent! ('') See the last link

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