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

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 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 cong thanh van ban.
• Adding a wildcard symbol may retrieve word variants: 30 trieu tinh - ((hanh tang) or (anh tang)) cua dung cong thanh van ban*.