Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham oc » tham nuoc, cham soc, tham hoa
cua tre » cua te, cuu tre, cua triet
oc van » hoc van, luoc van, quoc van
y nang » ky nang, ly nang, v nang
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: ((te sach) OR (toc sach)) y nang x hoi. hieu van tham oc van ((hanh lai) OR (hanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang x hoi. hieu van tham oc van ((hanh lai) or (hanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang x hoi. hieu van tham oc van ((hanh lai) or (hanh tai)) cua tre*.