Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien tach » chiet tach, vien bach, hien hanh
tranh cua » doanh cua, manh cua
cua tong » cua cong, cua dong, cua nong
cong van » cong vang, song van, cong tan
cong san » cong tac
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 ((hien tach) OR (thien hach)) - canh tranh cua tong ((cong van) OR (cong san)) toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) or (thien hach)) - canh tranh cua tong ((cong van) or (cong san)) toan ban*.