Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
thanh cac » hanh cac, thanh bac, thanh ca
trung va » truong va, trang va, trung ha
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cap » khan cap, thanh lap, than cua

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 - thanh trung va nhung ((cong dan) or (cong san)) ((than cap) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - thanh trung va nhung ((cong dan) OR (cong san)) ((than cap) OR (thanh cac)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - thanh trung va nhung ((cong dan) or (cong san)) ((than cap) or (thanh cac))*.