Did program support for the poorest areas work? : Evidence from rural Vietnam / Hai-Anh H. Dang (World Bank, GLO, IZA, Indiana University, London School of Economics and Political Science and University of Economics Ho Chi Minh City), Klaus Deininger (World Bank), Cuong Viet Nguyen (International School, Vietnam National University and Thang Long University) ; IZA Institute of Labor Economics