Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, le thanh
sang cua » mang cua, song cua, hang cua
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. hieu va giao duc ((((va thanh) OR (ban thanh))) OR (va tinh)) sang cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. hieu va giao duc ((((va thanh) OR (ban thanh))) or (va tinh)) sang cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. hieu va giao duc ((((va thanh) OR (ban thanh))) or (va tinh)) sang cua tre*.