Perhaps you should try some spelling variations:
thanh hang » thanh hoang, thanh thang, tranh hang
hanh trinh » canh tranh, hanh chinh
nang cong » nang song, dang cong, bang cong
25 trieu » 30 trieu
tap toan » tap doan, tap quan
bai toan » bai tap
va nang » van nang, da nang, cam nang

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 - ((thanh hang) or (hanh trinh)) va nang cong ((tap toan) OR (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: 25 trieu tinh - ((thanh hang) OR (hanh trinh)) va nang cong ((tap toan) OR (bai toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "25 trieu tinh - ((thanh hang) or (hanh trinh)) va nang cong ((tap toan) OR (bai toan)) ban".
• Adding a wildcard symbol may retrieve word variants: 25 trieu tinh - ((thanh hang) or (hanh trinh)) va nang cong ((tap toan) OR (bai toan)) ban*.