Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
quan hoang » luan hoan
van hang » van khang, van hoang, van thang
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
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 - canh trinh ((van hang) or (quan hoang)) cong tac phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh ((van hang) OR (quan hoang)) cong tac phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh ((van hang) or (quan hoang)) cong tac phan dau*.