A landslide buried a passenger bus on a treacherous mountain pass in Vietnam, killing six people and injuring 19 others, as more heavy rain was forecast for the week.The earth and rocks collapsed onto the bus late on Sunday as it was travelling through the Khanh Le pass in the central highlands, state media reported.The winding, 33km (20 mile) stretch carved into steep mountainsides is scenic and popular with tourists but prone to landslides in the rainy season.The landslide crushed the front...