Soak the mushrooms, lilies and noodles in warm water for 10 minutes. Cut the noodles in 3 inch lengths and set aside. Heat oil in skillet and saute for 30 seconds. Stir in pork, salt and sugar. Add chicken broth, bring to a boil. Add shrimp, mushrooms, lilies and fish sauce. Lower heat and simmer for 5 minutes. Add noodles, cook stirring for 1 minute. Remove from heat, add scallions and pepper. Stir and serve.