Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
hieu lang » chieu sang, hieu quang, nhieu tang
cong luan » tong luan, cong tuan, dong luan
doi hieu » doi chieu, doc hieu, doi hien
thong tu » phong tuc, thong tin, thong ke
cong dan » cong san, cong tan, huong dan
quan lap » quan luan, quang lam, quan lang
tu cong » thu cong, te cong, tai cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - thanh thong tu cong ((cong dan) or (cong luan)) quan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh thong tu cong ((cong dan) OR (cong luan)) quan lap.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh thong tu cong ((cong dan) or (cong luan)) quan lap*.