Perhaps you should try some spelling variations:
chieu sang » chieu xanh, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
trung cong » truong cong, trong cong, trung uong
hieu lang » hieu quang, nhieu tang, hieu van
cua trung » cua truong, xuan trung, cua nhung
ban thanh » ban hanh, ban hang
thanh cac » hanh cac, thanh bac, thanh ca
cong cua » cong cu, dong cua, huong cua
cong ban » cong bang, cong san, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((chieu sang) or (hieu lang))) or (chieu sach)) - thanh cong cua trung cong ban thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((chieu sang) OR (hieu lang))) OR (chieu sach)) - thanh cong cua trung cong ban thanh cac.
• Adding a wildcard symbol may retrieve word variants: hoc ((((chieu sang) or (hieu lang))) or (chieu sach)) - thanh cong cua trung cong ban thanh cac*.