Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
toc van » hoc van, toc san, tac van
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ca cua » co cua

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: ((tu sach) OR (thu sach)) y nang ((le hoi) OR (ma hoa)). hieu va cac toc van hanh ca cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang ((le hoi) or (ma hoa)). hieu va cac toc van hanh ca cua tre*.