Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hanh tang » hanh trang, hanh mang, hanh tung
thanh van » thanh san, thanh toan, thanh phan
30 trieu » 25 trieu
anh tang » anh bang, anh dang, anh nang
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: 30 trieu tinh - ((hanh tang) or (anh tang)) ((cua dung) OR (cua dong)) cong thanh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: 30 trieu tinh - ((hanh tang) OR (anh tang)) ((cua dung) OR (cua dong)) cong thanh van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "30 trieu tinh - ((hanh tang) or (anh tang)) ((cua dung) OR (cua dong)) cong thanh van ban".
• Adding a wildcard symbol may retrieve word variants: 30 trieu tinh - ((hanh tang) or (anh tang)) ((cua dung) OR (cua dong)) cong thanh van ban*.