Perhaps you should try some spelling variations:
thanh phong » thanh phuong, khanh phong, thanh hong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
dung cong » dung trong
cong thai » cong hai, hong thai, cong thanh
tuc dung » thuc dung, tac dung, duc dung
thai dan » thai doan, thai danh, thoai dan

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 phong tuc dung cong thai dan ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu sang) OR (hieu lang)) - thanh phong tuc dung cong thai dan ca".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) OR (hieu lang)) - thanh phong tuc dung cong thai dan ca*.