Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
nong cong » cong cong, tong cong, nang cong
tam nong » lam nong, tam duong, tam huong
cong san » cong tac
san phan » san pham, van phan, sat phan
phan dau » phan tu, hang dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chinh sach) or (hieu lang)) - thanh trung tam nong cong san phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - thanh trung tam nong cong san phan dau.
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - thanh trung tam nong cong san phan dau*.