Perhaps you should try some spelling variations:
ban nuoc » ban duoc, ban nuoi, ban thuoc
thu sach » tu sach, thuat sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
va dang » van dang, va lang, da dang
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) or (x ho)). thi van ban nuoc ((va dang) OR (va nang)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (x ho)). thi van ban nuoc ((va dang) OR (va nang)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) or (x ho)). thi van ban nuoc ((va dang) OR (va nang)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) or (x ho)). thi van ban nuoc ((va dang) OR (va nang)) thai cua tre*.