Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu van » hieu va, thien van, lieu va
trung va » truong va, trang va, trung ha
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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