Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nang cong » nang song, dang cong, hang cong
bang cong » dang cong, bang song, hang cong
manh toan » thanh toan, anh tuan, tinh toan
ho trieu » mot trieu, 25 trieu, ho chieu
30 trieu » 25 trieu
trinh ve » trinh he, trinh va, trinh vi
toan cau » 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 (30 trieu)) tinh - canh trinh ve ((nang cong) OR (bang cong)) manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho trieu) or (30 trieu)) tinh - canh trinh ve ((nang cong) OR (bang cong)) manh toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho trieu) or (30 trieu)) tinh - canh trinh ve ((nang cong) OR (bang cong)) manh toan cau*.