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