Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh tang » hanh trang, hanh mang, hanh tung
dung song » dung cong, dung dong, dong song
vung song » vung dong, xuong song, nang song
xanh tuan » anh tuan, manh tuan, thanh tuan
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
tuan tap » toan tap, tuan tai, tuyen tap

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: doc hieu xanh - ((hanh tang) OR (anh tang)) dan ((dung song) OR (vung song)) xanh tuan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((hanh tang) or (anh tang)) dan ((dung song) OR (vung song)) xanh tuan tap~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((hanh tang) or (anh tang)) dan ((dung song) OR (vung song)) xanh tuan tap*.