Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
kho tang » cao tang
cham duc » pham duc, cham soc, pham duy
anh thai » anh thi, anh tai, nhanh thai
thai cua » than cua, tai cuc, tri cua
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
va anh » van anh, va danh, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (toc sach)) kho tang xa hoi. hieu va cham duc va anh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (toc sach)) kho tang xa hoi. hieu va cham duc va anh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (toc sach)) kho tang xa hoi. hieu va cham duc va anh thai cua tre*.