Perhaps you should try some spelling variations:
thong tong » thong thong, thong trong, thong cong
25 trieu » 30 trieu
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban cua
tong tap » tuong tac, trong tan, cong tac
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "25 trieu tinh - hanh ((tang cua) OR (mang cua)) thong tong tap toan cao~".
• Adding a wildcard symbol may retrieve word variants: 25 trieu tinh - hanh ((tang cua) OR (mang cua)) thong tong tap toan cao*.