Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh dung » thanh duong, thanh tung, thanh hung
thuong dan » thuong han, thuong dam, thuong lan
hieu lang » hieu quang, nhieu tang, hieu van
luan cong » luat cong, luong cong, luan chung
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 lang)) - thanh dung luan cong ((thuong dan) OR (huong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh dung luan cong ((thuong dan) OR (huong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - thanh dung luan cong ((thuong dan) OR (huong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - thanh dung luan cong ((thuong dan) OR (huong dan)) toan cao*.