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
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
dan tai » van tai, dan thi, han tai
tai cao » thai cao, tao cao, tai sao

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