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