Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
tuong cong » truong cong, tong cong, luong cong
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
van toan » van tuan, van tan, van thanh
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: toc ((thieu sach) OR (thien hach)) - hanh tang luan ((tuong cong) OR (trong cong)) van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) OR (thien hach)) - hanh tang luan ((tuong cong) or (trong cong)) van toan cao~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) OR (thien hach)) - hanh tang luan ((tuong cong) or (trong cong)) van toan cao*.