Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
cua dang » cua ban
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (kien sach)) - hanh trang ((cua dang) or (cua cong)) cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh trang ((cua dang) OR (cua cong)) cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - hanh trang ((cua dang) or (cua cong)) cong san toan cao*.