Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhung cong » thong cong, hang cong, nhung don
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
dung cong » dung trong
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 thien hach - canh tranh cua ((nhung cong) OR (dung cong)) van toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - canh tranh cua ((nhung cong) or (dung cong)) van toan cao*.