Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
manh dung » manh hung, manh tung, anh dung
trong tap » trong thap, trong tan, trong tai
dung cua » dung luan, dung cho
cua dung » cua dang, cua dong, qua dung
tong tap » tuong tac, trong tan, cong tac
doan ban » doanh ban, toan ban, doan van

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: hoc ((chieu xanh) OR (chieu sang)) - manh dung cua dung ((trong tap) OR (tong tap)) doan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu sang)) - manh dung cua dung ((trong tap) OR (tong tap)) doan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sang)) - manh dung cua dung ((trong tap) OR (tong tap)) doan ban*.