Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh dung » thanh duong, thanh tung, thanh hung
hieu lang » hieu quang, nhieu tang, hieu van
cu phuong » cuu phuong, cau phuong, cua phuong
thong den » thong dien, tuong den, thong dieu
thong dan » thong van, tuong dan, trong dan
toan tap » toan ban
dung cu » dung cua, dung co, dung cho

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: doi ((hieu lang) OR (chieu sang)) - thanh dung cu phuong ((thong den) OR (thong dan)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (chieu sang)) - thanh dung cu phuong ((thong den) OR (thong dan)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sang)) - thanh dung cu phuong ((thong den) OR (thong dan)) toan tap*.