Vora does not counter Zhin for he has high damage plus sustain. He can time your obliterate w/billow&dash to counter it or cleanse bleed w/billow. To fight him: build stacks then fight. If not max stacks keep outside his basics
You can win against a khan for his high sustain plus damage. If spotted get behind and create a crossfire to make him show his back to your team or to die from your poke.
This matchup is extremely difficult, but try to make her waste her fire by going planted, then immediately switching to travel form. (note that you will still take much damage but it won't be an insta kill)