Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
than ban » thanh ban, than man, nhuan ban
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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: ho hieu lang - thanh ((trung cua) OR (trung cap)) dung cong dan ((than ban) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh ((trung cua) or (trung cap)) dung cong dan ((than ban) or (toan ban))*.