ISSN 1990-6145 www.arpnjournals.com MANAGEMENT MEASURES FOR IMPROVING AN DUONG LAKE WATER QUALITY FOR CHI LANG NAM STORK ISLAND CONSERVATION AND ECOTOURISM DEVELOPMENT Tran Yem, Nguyen Xuan Hai and Nguyen Manh Khai Faculty of Environmental Sciences, VNU University of Science (HUS), Vietnam National...