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
cong ngang » cong nhan, cong quang, cong lang
ngang nhan » hoang nhan, ngan han, bang nhan
dung cong » dung trong
nhan tai » hang tai, van tai, toan tai
va dung » van dung, va duong, vat dung

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) OR (thanh cong)) va dung cong ngang nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) OR (tien thanh)) - ((thanh trung) OR (thanh cong)) va dung cong ngang nhan tai".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) OR (tien thanh)) - ((thanh trung) OR (thanh cong)) va dung cong ngang nhan tai*.