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
nam quan » nam huan, sam quan, tam quan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nam qua » nam cua, nam mua, nam xua
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: te sach ky nang ((xa hoi) or (ma hoa)). hieu van ((nam qua) or (nam quan)) ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((xa hoi) OR (ma hoa)). hieu van ((nam qua) OR (nam quan)) ban thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((xa hoi) or (ma hoa)). hieu van ((nam qua) or (nam quan)) ban thanh vai cua tre*.