Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
va thanh » ban thanh, va tinh, le thanh
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
dau xuc » dau xac, dau xua, dau nuoc
van dau » van dao, phan dau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. hieu van dau xuc ((ban hanh) or (((va thanh) or (gia thanh)))) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu van dau xuc ((ban hanh) OR (((va thanh) OR (gia thanh)))) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu van dau xuc ((ban hanh) or (((va thanh) or (gia thanh)))) vi cua tre*.