After 30 minutes, add chayote and corn. Cover and simmer again over low heat for about 15 minutes or until chicken is tender and veggies are cooked.
You may add fish sauce at this point. If not, add it to your share before enjoying. If not using fish sauce, you can just use salt. Adding a squeeze of lemon, calamansi or lime would be great as well.
Serve hot with warm rice or enjoy as is.