Perhaps you should try some spelling variations:
nhung luong » hung luong, nhung huong, nhung tuong
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
luong tac » luong tai, luong cac, tuong tac
tuong va » truong va, thuong va, luong va
quan lap » quan luan, quang lam, quan lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sang) or (hieu lang)) - thanh tuong va nhung luong tac quan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu lang)) - thanh tuong va nhung luong tac quan lap.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (hieu lang)) - thanh tuong va nhung luong tac quan lap*.