Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
ca thuong » cao thuong, cua thuong, va thuong
cong danh » cuong danh, cong thanh, cong khanh
doi hieu » doi chieu, doc hieu, doi hien
lang dan » lang van, tang dan, dang dan
cong dan » cong san, cong tan, huong dan
thanh tu » hanh tu, nhanh tu, thanh tung

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: doi hieu lang - lang dan ca thuong ((cong danh) OR (cong dan)) thanh tu~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - lang dan ca thuong ((cong danh) or (cong dan)) thanh tu*.