Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
thanh tung » thanh cong
dong cong » duong cong, dung cong, dang cong
tung cua » trung cua, tuong cua, dung cua
cua dong » chua dong, cua cong, cua dang
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 nhanh) or (tien thanh)) - thanh tung cua dong cong ((dan toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - thanh tung cua dong cong ((dan toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (tien thanh)) - thanh tung cua dong cong ((dan toan) or (van toan)) cao*.