Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
doanh phan » doanh nhan, doan phan, doanh thanh
trung vat » trung va, trung van, trong vat
dung cong » dung trong
vat dung » van dung, va dung, viet dung
dan phan » doan phan, dan chan, van phan

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 trung vat dung cong ((dan phan) or (doanh phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - thanh trung vat dung cong ((dan phan) OR (doanh phan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (tien thanh)) - thanh trung vat dung cong ((dan phan) or (doanh phan)) cau*.