Cut fish into 2" strips. In a bowl, blend 1 Tblsp. each soy and cornstarch with rice wine. Stir in fish; cover and marinate about 30 minutes. In a small bowl, combine the chicken stock with the remaining soy sauce and cornstarch and the sugar. Heat a wok over high heat until hot. Add 1 Tblsp. oil and heat until oil sizzles when a small piece of fish is added. Add the fish to the oil. Using a metal spatula to turn the strips, stir-fry them about 3 minutes, until golden. Using a slotted spoon, transfer the fish to a plate. Heat the remaing oil in the wok as in step above. Add corn, water chestnuts, broccoli, and chile peppers, and stir-fry about 4 minutes. Stir in cornstarch mixture and cook, stirring constantly, about 1 minute. Return the fish to the wok and cook 1 minute longer. Serve at once with steamed rice.