Whisk together Fish sauce, soy sauce, and vinegar in one small bowl
Chop the garlic and 3 bird's nest (or 2 habanero) chilis together in another bowl
Smash remaining chili(s) and set aside
Heat a wok/frying pan to medium-high. Add oil, garlic/chili mix, and onions; cook about 30 seconds. Add meat and a splash of the liquid mixture; cook until just cooked through, about 5 minutes.
Add peppers and noodles and remaining liquid. Toss together until noodles are fully cooked. Mix in basil and smashed chilis, toss until thoroughly mixed, and serve.