Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
doan tien » doan thien, doanh tien, toan tien
trinh han » trinh quan
trinh thi » trinh tai, dinh thi, trinh tu
trong dan » trong dang, trong san, trong tan
dan toan » van toan, dan than, 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: doan tien thanh - hanh ((trinh han) OR (trinh thi)) dung trong dan toan cau~.
• Adding a wildcard symbol may retrieve word variants: doan tien thanh - hanh ((trinh han) or (trinh thi)) dung trong dan toan cau*.