Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
hanh trung » thanh trung, hanh trang, manh trung
trung vat » trung va, trung van, trong vat
trong dan » trong dang, trong san, trong tan
vat dung » van dung, va dung, viet dung
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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