Perhaps you should try some spelling variations:
chiet tach » chieu sach
hien tach » thien hach, vien bach, hien hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan dang » luan nang, luan danh, luan dong
cong dan » cong san, cong tan, cong dong
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: hoc ((hien tach) OR (chiet tach)) - hanh tang luan dang ((cong dan) OR (huong dan)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) OR (chiet tach)) - hanh tang luan dang ((cong dan) or (huong dan)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) OR (chiet tach)) - hanh tang luan dang ((cong dan) or (huong dan)) toan cao*.