Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
doi hieu » doi chieu, doc hieu, doi hien
cong tan » cong tac, cong san, cong thanh
tan ban » toan ban, tang ban, van ban
ban can » ban dan, ban hang, ban hanh

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 - ((hanh chinh) OR (canh tranh)) ((cua thong) OR (cua khong)) cong tan ban can~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((hanh chinh) or (canh tranh)) ((cua thong) or (cua khong)) cong tan ban can*.