Perhaps you should try some spelling variations:
chien thang » chien thuong, chien chong, hien trang
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chien » hoc hien, hoach chien, hoc chuyen
tranh cua » doanh cua, manh cua
cong cong » trong cong, dung cong, dang cong
san toan » van toan, dan toan, manh toan
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 chien thang - hanh tranh cua ((cong cong) OR (cong dong)) san toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc chien thang - hanh tranh cua ((cong cong) or (cong dong)) san toan ban*.