Perhaps you should try some spelling variations:
cong quang » luong quang, thong quang, duong quang
hanh dang » hanh dong, anh dang, hanh mang
hanh dung » thanh dung, anh dung, hanh dong
dung cong » dung trong
25 trieu » 30 trieu
nhan tai » van tai, toan tai
hang tai » hang va, dung tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: 25 trieu tinh - ((hanh dang) or (hanh dung)) su dung cong quang ((nhan tai) OR (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: 25 trieu tinh - ((hanh dang) OR (hanh dung)) su dung cong quang ((nhan tai) OR (hang tai))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "25 trieu tinh - ((hanh dang) or (hanh dung)) su dung cong quang ((nhan tai) OR (hang tai))*".