Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
cua thuong » cua truong, cua phuong, ca thuong
hieu lang » chieu sang, hieu quang, nhieu tang
lanh bang » anh bang, lanh sang, can bang
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
doc hieu » toc thieu, hoc thieu, hoc hien
lanh ban » lang ban, doanh ban, tranh 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: doc hieu lang - ((lanh ban) OR (lanh bang)) cua thuong cong doan phan tu~.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((lanh ban) or (lanh bang)) cua thuong cong doan phan tu*.