Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doan tien » doan thien, doanh tien, toan tien
trinh thi » trinh tai, dinh thi, trinh tu
trinh hoa » trinh do, trinh han
trinh he » trinh han, trinh ky, trinh do
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van 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: doan tien thinh - hanh ((((trinh he) OR (trinh thi))) OR (trinh hoa)) nhung cong san toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doan tien thinh - hanh ((((trinh he) OR (trinh thi))) or (trinh hoa)) nhung cong san toan ban~".
• Adding a wildcard symbol may retrieve word variants: doan tien thinh - hanh ((((trinh he) OR (trinh thi))) or (trinh hoa)) nhung cong san toan ban*.