To season the shrimp, on a plate, add the shrimp, salt, white pepper, and cornstarch. Mix until evenly coated and set aside.
Cut the Chinese broccoli into bite-sized pieces and mince the garlic.
To make the sauce, in a bowl, whisk together the soy sauce, dark soy sauce, oyster sauce, fish sauce, sugar, and water until combined.
To cook the rice noodles, in a pot over high heat, bring water to a boil. Add the dried rice noodles and cook for about 3 minutes, just until softened. Immediately transfer the noodles to cold water, then drain well.
To stir-fry the shrimp, in a wok over high heat, add 1 tablespoon of cooking oil. Add the shrimp and garlic, then stir-fry for about 1 minute, just until the shrimp turn lightly pink. Remove and set aside.
To stir-fry the eggs and Chinese broccoli, in the wok over high heat, add 1 tablespoon of cooking oil. Crack the eggs and stir-fry until partially set, then push them to the side. Add the Chinese broccoli and stir-fry for about 1 minute until slightly softened. Remove and set aside.
To make the pad see ew, in the wok over high heat, add the remaining 1 tablespoon of cooking oil. Add the drained rice noodles and stir-fry until heated through. Return the shrimp, eggs, and Chinese broccoli to the wok, then pour in the sauce. Toss everything together for about 1 minute until the noodles absorb the sauce. Let the noodles sit undisturbed for about 15 seconds, then give everything one final toss and serve immediately.