Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
dia danh » dia ban, gia dinh
van dinh » van minh, van dich, va dinh
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va tham thuc ((((va danh) or (dia danh))) or (van dinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu va tham thuc ((((va danh) OR (dia danh))) OR (van dinh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu va tham thuc ((((va danh) or (dia danh))) or (van dinh)) vai cua tre*.