Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu lang » chieu sang, hieu quang, nhieu tang
van phong » van dong, hai phong
va phuong » va thuong, cac phuong
dung manh » duong manh, dung danh, hung manh
hoi hieu » hoi phieu, hoi tieu, moi hieu
toan tap » toan ban
toan cao » toan ban

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: hoi hieu lang - canh trinh ((van phong) OR (va phuong)) dung manh ((toan tap) OR (toan cao))~.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - canh trinh ((van phong) or (va phuong)) dung manh ((toan tap) or (toan cao))*.