Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
thuong cong » thong cong, thuong con, truong cong
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh khan » thanh phan, thanh nhan, thanh thanh
hieu lang » hieu quang, nhieu tang, hieu van
manh dung » manh hung, manh tung, anh dung
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) OR (hieu lang)) - manh dung va ((thuong cong) OR (thuong dong)) thanh khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (hieu lang)) - manh dung va ((thuong cong) OR (thuong dong)) thanh khan cap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (hieu lang)) - manh dung va ((thuong cong) OR (thuong dong)) thanh khan cap*.