Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dau

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 lang xa hoi. hieu ((va cam) or (vo co)) xuc ((va danh) OR (va dan)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu ((va cam) OR (vo co)) xuc ((va danh) OR (va dan)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang xa hoi. hieu ((va cam) or (vo co)) xuc ((va danh) OR (va dan)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ((va cam) or (vo co)) xuc ((va danh) OR (va dan)) vai cua tre*.