Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chau tinh » cuu tinh, ha tinh, cua tinh
luat dang » luat danh, luat doanh, luat quang
luat dan » luat dat, luat doanh, cua dan
tong tap » tuong tac, trong tan, cong tac
tap toan » tap doan, tap quan, bai 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: lai chau tinh - hanh trinh ((luat dang) OR (luat dan)) tong tap toan cau~.
• Adding a wildcard symbol may retrieve word variants: lai chau tinh - hanh trinh ((luat dang) or (luat dan)) tong tap toan cau*.