Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
doan tien » doan thien, doanh tien, toan tien
trinh thi » trinh tai, dinh thi, trinh tu
trinh hoa » trinh do, trinh han
dung cong » dung trong
tranh he » trinh he, tranh ha, tinh he
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 - canh ((((tranh he) OR (trinh thi))) OR (trinh hoa)) dung cong san toan cao~.
• Adding a wildcard symbol may retrieve word variants: doan tien thanh - canh ((((tranh he) or (trinh thi))) or (trinh hoa)) dung cong san toan cao*.