Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
hieu lang » hieu quang, nhieu tang, hieu van
trung hoc » trung quoc
dung cong » dung trong
hoc dung » hoc ung, hoc dan, tac dung
cong bui » cong bi, cuong bai, hoang bui

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 (chieu xanh))) or (hieu lang)) - thanh trung hoc dung cong bui van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((chieu sang) OR (chieu xanh))) OR (hieu lang)) - thanh trung hoc dung cong bui van ban.
• Adding a wildcard symbol may retrieve word variants: ho ((((chieu sang) or (chieu xanh))) or (hieu lang)) - thanh trung hoc dung cong bui van ban*.