Place bean threads in large bowl and cover with hot water. After 5 minutes, drain water.
Heat olive oil in wok or large skillet over medium-high heat. Add onion, ginger and garlic. Stir fry for 30 seconds. Add beef and stir fry for 2 more minutes.
Deglaze pan with rice wine. Add fish sauce, soy sauce, red pepper flakes and beef stock. Bring broth to simmer. Add broccoli and cover. Simmer for about 3 to 4 minutes until broccoli is almost tender. Add noodles to pan and completely submerge them. Cook for another 3-4 minutes. Remove from heat and garnish with the chopped green onion.