- Lonely Planet Vietnam, Cambodia, Laos & Northern Thailand is your passport to the most relevant, up-to-date advice on what to see and skip, and what hidden discoveries await you. Tempt your tastebuds with pho noodle soup in Vietnam, sail past the limestone peaks of Halong Bay, or experience the transcendent tranquility of temples like Angkor Wat; all with your trusted travel companion. Get to the heart of Vietnam, Cambodia, Laos & Northern Thailand and begin your journey now!