Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nham thu » nham thuc, nam thu, pham thu
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu va
vi cua » vai cua, di cua
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: ((vu sach) or (toc sach)) ky nang x hoi. hieu va nham thu va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky nang x hoi. hieu va nham thu va hanh vi cua tre*.