Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ky tang » kho tang, ky trong, tay tang
ky dang » ky danh
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((((ky tang) OR (ky nang))) or (ky dang)) xa hoi. hieu van cam duc ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((ky tang) OR (ky nang))) OR (ky dang)) xa hoi. hieu van cam duc ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((((ky tang) OR (ky nang))) or (ky dang)) xa hoi. hieu van cam duc ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((((ky tang) OR (ky nang))) or (ky dang)) xa hoi. hieu van cam duc ban thanh vai cua tre*.