Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
nguong dan » huong dan
hieu lang » hieu quang, nhieu tang, hieu van
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
toan ban » van ban
va hang » van hang, va nang, va lang

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 lang)) - thanh trung va hang ((cong dan) or (nguong dan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh trung va hang ((cong dan) OR (nguong dan)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (hieu lang)) - thanh trung va hang ((cong dan) or (nguong dan)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (hieu lang)) - thanh trung va hang ((cong dan) or (nguong dan)) toan ban*.