Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
30 trieu » 25 trieu
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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: 30 trieu tinh - hanh tranh cua thong cong ((((tac toan) OR (tap toan))) OR (tinh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "30 trieu tinh - hanh tranh cua thong cong ((((tac toan) OR (tap toan))) or (tinh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: 30 trieu tinh - hanh tranh cua thong cong ((((tac toan) OR (tap toan))) or (tinh toan)) cau*.