Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh dung » thanh duong, thanh tung, thanh hung
hieu manh » hieu nganh, dieu hanh, hien hanh
va phuong » va thuong, cac phuong
thong dan » thong van, tuong dan, thong den
va thong » va thuong, he thong, va cong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 manh) OR (chieu xanh)) - thanh dung ((va thong) OR (va phuong)) thong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) or (chieu xanh)) - thanh dung ((va thong) OR (va phuong)) thong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (chieu xanh)) - thanh dung ((va thong) OR (va phuong)) thong dan toan cao*.