Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cam duc » cam xuc, cao duc, nam duoc
hoi cua » hoi chuc
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 nang xa hoi. hieu van ((cam duc) OR (pham duc)) ban thanh hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van ((cam duc) OR (pham duc)) ban thanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van ((cam duc) OR (pham duc)) ban thanh hoi cua tre*.