In a large bowl, whisk together lemongrass, 2 tbsp fish sauce, honey, soy sauce, minced garlic, and oil to create the marinade.
Add chicken strips to the marinade, tossing to coat thoroughly, and refrigerate for at least 30 minutes.
Prepare the dressing by whisking 1/4 cup fish sauce, lime juice, water, sugar, and chili garlic sauce until the sugar is fully dissolved.
Cook rice vermicelli in boiling water for 3 to 5 minutes until tender; drain and rinse immediately with cold water to stop the cooking process.
Preheat a grill or heavy skillet over medium-high heat and cook chicken for 4 to 5 minutes per side until charred and cooked through.
Divide shredded lettuce and cooked vermicelli noodles among four serving bowls.
Top each bowl with grilled chicken, bean sprouts, pickled vegetables, cucumber, mint, and cilantro.
Garnish with crushed peanuts and serve with the prepared dressing on the side.