Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van bao » van ban, van dao
bao luc » bao thuc
luc tan » luc tai, duc tan, luc tam
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
o hai » co hai, so hai, o lai
o hoc » co hoc, mo hoc, so hoc

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 y nang ((o hai) or (o hoc)). hieu van bao luc tan thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hai) OR (o hoc)). hieu van bao luc tan thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hai) or (o hoc)). hieu van bao luc tan thanh vai cua tre*.