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
sach ky » sac ky, sach y, sach ty
cao duc » dao duc, cao suc, tao duoc
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu van ((cao duc) or (giao duc)) ban thanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van ((cao duc) OR (giao duc)) ban thanh vai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu van ((cao duc) or (giao duc)) ban thanh vai ((cua tre) or (cua te))*.