Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hieu xanh » chieu xanh, hieu manh, dieu hanh
quan dang » quang dang, quan lang, quan dong
canh dan » canh van, sanh dan, thanh dan
dan quan » van quan, ban quan, dan luan
cong van » cong vang, song van, cong tan
cong san » cong tac
phan cau » phan dau, phan cac, phan tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - canh dan quan dang ((cong van) OR (cong san)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (hieu nganh)) - canh dan quan dang ((cong van) OR (cong san)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (hieu nganh)) - canh dan quan dang ((cong van) OR (cong san)) phan cau*.