Perhaps you should try some spelling variations:
thiet yeu » thiet ke, theo yeu
hanh mang » nhanh mang, hanh trang, nhanh lang
va duong » van duong, va tuong, va dong
va huong » va thuong, va phuong, va tuong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » 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: ((thiet yeu) OR (theo tieu)) tinh - hanh mang ((va duong) OR (va huong)) cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thiet yeu) or (theo tieu)) tinh - hanh mang ((va duong) OR (va huong)) cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((thiet yeu) or (theo tieu)) tinh - hanh mang ((va duong) OR (va huong)) cong dan toan cau*.