Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
vien cac » vien bach, vien dai, gian cac
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
vien da » vien dai, hien dai
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
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 cac ((ky lang) or (ky dang)) xa hoi. hieu ((vien cac) or (vien da)) xuc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ((ky lang) OR (ky dang)) xa hoi. hieu ((vien cac) OR (vien da)) xuc ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su cac ((ky lang) or (ky dang)) xa hoi. hieu ((vien cac) or (vien da)) xuc ban thanh dai cua tre*.