Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh lai » danh sai, gianh lai, dinh lam
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
cam duc » cao duc, pham duc, nam duoc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sang ma » nang ma, sang tao, mang may
tang ma » mang may, tang van
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: toc sach ky ((sang ma) or (tang ma)) hoi. hieu ve ((cam duc) or (cam xuc)) va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((sang ma) OR (tang ma)) hoi. hieu ve ((cam duc) OR (cam xuc)) va danh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((sang ma) or (tang ma)) hoi. hieu ve ((cam duc) or (cam xuc)) va danh lai cua tre*.