Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 thanh - hanh tranh cua ((hang cong) OR (bang cong)) ((san toan) OR (van toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien thanh - hanh tranh cua ((hang cong) or (bang cong)) ((san toan) OR (van toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - hanh tranh cua ((hang cong) or (bang cong)) ((san toan) OR (van toan)) cao*.