Perhaps you should try some spelling variations:
hien nhanh » thien thanh, tien thanh, dien thanh
hien hanh » dieu hanh
hanh hang » thanh hang, hang hang, hanh han
hang chua » hang cua, zhang chuan, phong chua
chua dang » cua dang, chua dong, chua nang
dang cong » dung cong
cong dang » cong dong, cong dan, cong dung
dang tran » dang thanh, quang tran, hoang tran
tran chau » tranh chap, tran huu

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 (hien hanh)) - hanh hang chua dang cong dang tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (hien hanh)) - hanh hang chua dang cong dang tran chau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (hien hanh)) - hanh hang chua dang cong dang tran chau*.