Perhaps you should try some spelling variations:
trinh cua » trinh luat, trinh quan, trinh luan
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
30 trieu » 25 trieu
tinh cua » sinh cua, tinh chat, tranh cua
toan cau » toan ban, toan tap, toan tai
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: 30 trieu tinh - nhanh ((tinh cua) OR (trinh cua)) dung cong manh ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "30 trieu tinh - nhanh ((tinh cua) OR (trinh cua)) dung cong manh ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: 30 trieu tinh - nhanh ((tinh cua) OR (trinh cua)) dung cong manh ((toan cau) or (toan cao))*.