Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh lam » thanh lap, hanh lam, thanh nam
thuc ban » thuoc ban, thuc dan, thuc van
lam cua » nam cua, lam chat
thu ban » thu hang
tu sach » thu sach, su sach, te sach
va bach » va cach, vu bach, va bac
hieu va » lieu va, hieu qua
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) ky nang x hoi. hieu va bach ((thuc ban) OR (thu ban)) thanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang x hoi. hieu va bach ((thuc ban) OR (thu ban)) thanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang x hoi. hieu va bach ((thuc ban) OR (thu ban)) thanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang x hoi. hieu va bach ((thuc ban) OR (thu ban)) thanh lam cua tre*.