Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
cong san » cong tac
phan dau » phan tu, hang dau
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - thanh ((tung cua) OR (dung cua)) thuong cong san ((phan dau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - thanh ((tung cua) OR (dung cua)) thuong cong san ((phan dau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - thanh ((tung cua) OR (dung cua)) thuong cong san ((phan dau) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh ((tung cua) OR (dung cua)) thuong cong san ((phan dau) or (than cap))*.