Watch Bombuj. In this illuminating study of cultural contrasts, American filmmaker Lynne Sachs and her sister, Dana, travel north from Ho Chi Minh City to Hanoi, recording conversations with Vietnamese strangers and friends. The sisters' expansive travel diary covers tourism, insights into city life, pervasive culture clashes and a bracing historic inquiry. What begins as a picaresque road trip soon blossoms into a richer social and political discourse.