Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hien hach » thien hach, hien hanh, hien khanh
tranh cua » doanh cua, manh cua
dong cong » duong cong, dung cong, dang cong
dang hanh » dang thanh, ban hanh, dang van
cua dong » chua dong, cua cong, cua dang
dan toan » van toan, dan than, manh toan

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 ((hien hach) OR (hien nhanh)) - canh tranh cua dong cong ((dang hanh) OR (dan toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hach) OR (hien nhanh)) - canh tranh cua dong cong ((dang hanh) or (dan toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hach) OR (hien nhanh)) - canh tranh cua dong cong ((dang hanh) or (dan toan)) cao*.