Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
tong cong » trong cong, cong cong, dung cong
cua tinh » cua sinh, ha tinh, hoa tinh
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap
va tinh » may tinh
va tong » va thong, va tuong, va trong

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: moc ((cua tinh) OR (va tinh)) - canh trinh va tong cong dan ((than cau) OR (toan cau))~.
• Adding a wildcard symbol may retrieve word variants: moc ((cua tinh) or (va tinh)) - canh trinh va tong cong dan ((than cau) or (toan cau))*.