Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung tac » trung tam, trong tac, trung tai
trong dan » trong dang, trong san, trong tan
tac dung » sach dung, xay dung, tin dung
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (chinh sach)) - thanh trung tac dung trong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chinh sach)) - thanh trung tac dung trong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chinh sach)) - thanh trung tac dung trong dan toan ban*.