Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
tuong cua » truong cua, huong cua, thong cua
hoi hieu » hoi phieu, hoi tieu, moi hieu
tung cua » trung cua, dung cua, tang cua
cong dan » cong san, cong tan, huong dan
than cap » khan cap, thanh lap, thanh cac

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: hoi hieu lang - thanh ((tung cua) OR (tuong cua)) thuong cong dan ((phan tu) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - thanh ((tung cua) OR (tuong cua)) thuong cong dan ((phan tu) or (than cap))~".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh ((tung cua) OR (tuong cua)) thuong cong dan ((phan tu) or (than cap))*.