Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh dung » thanh duong, thanh tung, thanh hung
hien sach » dien sach, kien sach, chieu sach
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
dung cua » dung luan, dung cho

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 (thien hach)) - thanh dung cua ((dung cong) or (trong cong)) van thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - thanh dung cua ((dung cong) OR (trong cong)) van thanh cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - thanh dung cua ((dung cong) or (trong cong)) van thanh cau*.