Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
van danh » van doanh, van anh, van hanh
danh dai » danh dau, danh di, danh sai
sach ky » sac ky, sach y, sach ty
lam duc » lam duoc, pham duc, nam duoc
duc van » duc va, duc tan, duc manh
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 nang x ho. ((hieu van) or (lieu va)) lam duc van danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x ho. ((hieu van) OR (lieu va)) lam duc van danh dai cua tre*.