Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
hanh tai » thanh tai, hang tai, han tai
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co hai » co dai, co hoi, o hai
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
cuc du » cac du
x hoi » xa hoi, o hoi, x ho

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: tu sac ky nang ((x hoi) OR (co hai)). hieu ((ve cam) OR (ve cac)) duc tan hanh tai cuc du~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((x hoi) or (co hai)). hieu ((ve cam) OR (ve cac)) duc tan hanh tai cuc du~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) or (co hai)). hieu ((ve cam) OR (ve cac)) duc tan hanh tai cuc du*.