Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hien sach » kien sach, thien hach, chieu sach
dien sach » dien anh
cua nhung » va nhung
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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 (dien sach)) - ((canh tranh) or (thanh trung)) cua nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (dien sach)) - ((canh tranh) OR (thanh trung)) cua nhung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (dien sach)) - ((canh tranh) or (thanh trung)) cua nhung cong san toan ban*.