Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
vien cac » vien bach, vien dai, vien da
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
dua ban » dia ban, cua ban, qua ban
su sac » su sach, su xac
ve cam » ve cham, ve cac, va cam
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su cac)) ky mang may hoi. hieu ((ve cam) or (vien cac)) dua ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky mang may hoi. hieu ((ve cam) OR (vien cac)) dua ban thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su cac)) ky mang may hoi. hieu ((ve cam) or (vien cac)) dua ban thanh hai cua tre*.