Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh huong
thanh tung » thanh cong
dong cong » duong cong, dung cong, dang cong
ho trieu » mot trieu, 25 trieu, 30 trieu
cua dong » chua dong, cua cong, cua dang
tap toan » tap quan, bai toan
tap doan » tap quan

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: ho trieu tinh - ((thanh truong) OR (thanh tung)) cua dong cong ((tap toan) OR (tap doan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho trieu tinh - ((thanh truong) or (thanh tung)) cua dong cong ((tap toan) OR (tap doan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho trieu tinh - ((thanh truong) or (thanh tung)) cua dong cong ((tap toan) OR (tap doan)) cau*.