Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
thien anh » thien danh, tien anh, thien thanh
dung song » dung cong, dung dong, dong song
vung song » vung dong, xuong song, nang song
hanh han » hanh nhan, hanh phan, hanh san
han viet » san viet, van viet, dan viet
van tan » van tuan, van ban, van tai
tan ca » tan cua, tang ca, dan ca

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: hoc ((thieu xanh) OR (thien anh)) - hanh han viet ((dung song) OR (vung song)) van tan ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - hanh han viet ((dung song) OR (vung song)) van tan ca~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - hanh han viet ((dung song) OR (vung song)) van tan ca*.