Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thieu » toc thieu, hoc hien
tong cong » trong cong, cong cong, dung cong
trang va » tran van, hang va
dan toan » van toan, dan than, manh toan
va tong » va thong, va tuong, va trong

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 thieu sach - hanh trang va tong cong ((dan toan) OR (tinh toan)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh trang va tong cong ((dan toan) or (tinh toan)) cao*.