Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
tong cong » trong cong, cong cong, dung cong
cong anh » cong danh, dong anh, hong anh
va tong » va thong, va tuong, va trong
tuan cu » tuan tu, quan cua, tuan thu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sang)) - hanh hang va tong cong anh tuan cu~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sang)) - hanh hang va tong cong anh tuan cu*.