Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu sach » chinh sach, chiet tach, chieu sang
luan trong » quan trong, luat trong, luan tuong
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
cong can » cong san, cong tan, cong dan
can ban » van ban, toan ban
ban tap » bai tap, han tap, ban tai

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: toc ((thieu xanh) OR (chieu sach)) - hanh tang luan trong cong can ban tap~.
• Adding a wildcard symbol may retrieve word variants: toc ((thieu xanh) or (chieu sach)) - hanh tang luan trong cong can ban tap*.