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
tong cong » trong cong, cong cong, dung cong
cua tong » cua cong, cua dong, cua nong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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 toan) OR (van tuan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) or (thien hach)) - canh tranh cua tong cong ((van toan) OR (van tuan)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) or (thien hach)) - canh tranh cua tong cong ((van toan) OR (van tuan)) ban*.