Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
hieu quan » hieu qua, lieu quan, thien quan
bang cong » dang cong, bang song, hang cong
trung ca » trung cap, truong ca, trung cua
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
ca bang » cao bang, can bang, cac bang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (hieu quan)) - thanh trung ca bang cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quan)) - thanh trung ca bang cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu quan)) - thanh trung ca bang cong san toan ban*.