Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh hanh » hanh han, nhanh thanh, thanh thanh
xanh hanh » danh thanh, ban hanh, van hanh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
toan ban » van ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh hanh) OR (xanh hanh)) va ((hang cong) OR (dang cong)) manh toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh hanh) or (xanh hanh)) va ((hang cong) or (dang cong)) manh toan ban*.