Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
cua tre » cua te, cuu tre, cua triet
va cham » va chat, va tham
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cac, va cao, va cai

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 ((ky tang) or (ky dang)) ma hoi. hieu ((va cam) OR (va cham)) duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky tang) OR (ky dang)) ma hoi. hieu ((va cam) OR (va cham)) duc ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) or (ky dang)) ma hoi. hieu ((va cam) OR (va cham)) duc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) or (ky dang)) ma hoi. hieu ((va cam) OR (va cham)) duc ban thanh dai cua tre*.