Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
tu sach » su sach, te sach, tu cach
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va, hieu qua
ban duc » ban duoc, van duc, ban dac
cua tre » cua te, cuu tre, cua triet
va ban » van ban, va bai, va bao
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: ((((tu sach) or (thu sach))) or (co sach)) ky nang x hoi. hieu va ban duc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (co sach)) ky nang x hoi. hieu va ban duc va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thu sach))) or (co sach)) ky nang x hoi. hieu va ban duc va thanh vi cua tre*.