What have Helen and Linh been doing for three years and why?

For three years Helen had taken pictures in Vietnam. However, not many people were interested in pictures of the destroyed country. So Helen and Linh began covering humanitarian stories as well as the ensuing crisis in Cambodia. Since that time the Khmer Rouge had taken over Cambodia. However, when South Vietnam finally fell a photo essay would be in high demand. Some of Helen and Linh's exploits are covered