In a small mixing bowl, whisk together the soy sauce, oyster sauce, sesame oil, brown sugar, ginger, salt and pepper, set aside.
Set a large pot of water of high heat, bring to a boil. Add in the noodles and cook according to the package's instructions, about 2-3 minutes, then drain.
Meanwhile, while the water is coming to a boil, in a large skillet set over medium-high heat, add the olive oil. When hot, add in the carrots, onion and celery, cooking until tender, about 3-4 minutes. Add in the garlic and cook until fragrant.
Stir in the cabbage, bok choy and water chestnuts, then the cooked noodles. Pour in the sauce and cook for 2-3 minutes or until the cabbage and boy choy become slightly wilted. Serve immediately.
Notes
*I used two packages of Yaki-Soba noodles (ramen noodles) and discarded the flavor packets- but feel free to visit your local Asian supermarket, they'll definitely have a bigger selection of noodles.