Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
lanh bang » anh bang, can bang, lap bang
lanh sang » anh sang, doanh sang, lam sang
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

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