Perhaps you should try some spelling variations:
tranh chua » tranh cua, trinh chuan, tranh chap
nang cong » nang song, dang cong, hang cong
bang cong » dang cong, bang song, hang cong
ho trieu » mot trieu, 30 trieu, ho chieu
25 trieu » 30 trieu
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho trieu) OR (25 trieu)) tinh - canh tranh chua ((nang cong) OR (bang cong)) tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho trieu) or (25 trieu)) tinh - canh tranh chua ((nang cong) OR (bang cong)) tac toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((ho trieu) or (25 trieu)) tinh - canh tranh chua ((nang cong) OR (bang cong)) tac toan cao*.