Soften the glass noodles in warm water for about 10 minutes, then drain and set aside
In a large frying pan or wok, pan-fry the shrimp with 1 tablespoon of vegetable oil at medium-high heat until orange and totally opaque. Remove and set aside.
In a pan, add garlic and sauté for 1 or 2 minutes. Then, add red chili, carrot, and cabbage. Cook, stirring constantly, until vegetables are crisp-tender.
Add the cooked, softened noodles and the appropriately cooked shrimp to the pan. Then add tomato.
Mix it well, then add the oyster sauce, soy sauce, sugar, and ground white pepper. Add green onions in the mix, then red chili. Stir-fry for another minute.
Put the Pad Woon Sen on the plate. Garnish with more green onions.