Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hien nhanh » hien hanh, tien thanh, dien thanh
thanh tung » thanh cong
dung cong » dung trong
cong van » cong vang, cong san, song van
van nhan » van phan, van thanh, danh nhan
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 (thien thanh)) - ((thanh trung) or (thanh tung)) va dung cong van nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - ((thanh trung) OR (thanh tung)) va dung cong van nhan tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) OR (thien thanh)) - ((thanh trung) or (thanh tung)) va dung cong van nhan tai".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) OR (thien thanh)) - ((thanh trung) or (thanh tung)) va dung cong van nhan tai*.