Perhaps you should try some spelling variations:
cua thuong » cua truong, cua phuong, ca thuong
hieu lang » chieu sang, hieu quang, nhieu tang
chinh cua » chinh ca, chinh sua, hinh cua
hoc hieu » hoc thieu, hoc hien, doc hieu
tong tap » tuong tac, trong tan, tong hop
cong tac » cong ty
toan cao » toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh chinh cua thuong ((tong tap) OR (cong tac)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh chinh cua thuong ((tong tap) OR (cong tac)) toan cao*.