Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh dang » hanh dong, anh dang, hanh dung
dang vat » dang van, dong vat, dang nhat
vat dung » van dung, va dung, viet dung
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
tan cau » toan cau, van cau, tan ca

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 - hanh dang vat dung ((cong van) or (song van)) tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - hanh dang vat dung ((cong van) OR (song van)) tan cau*.