Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
thanh tung » thanh cong
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
than cap » khan cap, thanh lap, thanh cac
toan tap » toan ban
tung va » trung va, tuong va, dung va
va dung » van dung, va duong, vat dung

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: hoc ((chieu xanh) OR (chieu sang)) - thanh tung va dung cong dan ((than cap) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sang)) - thanh tung va dung cong dan ((than cap) or (toan tap))*.