Place noodles in a large bowl of hot water to soften for about 10 minutes, per package directions. Meanwhile, in a 4- to 6-ounce Dutch oven, cook chicken, onion and garlic in 1 tablespoon hot oil over medium-high heat for 4 to 6 minutes or until chicken is no longer pink, stirring occasionally. Add broth, fish sauce, tamarind, honey and crushed red pepper; stir to combine. Bring to boiling; reduce heat. Drain and rinse the noodles. Add to Dutch oven, along with zucchini and bean sprouts. Cook and stir for 1 to 2 minutes or until noodles and zucchini are just tender and soup is heated through. Keep warm.