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

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 lai))) 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 lai))) OR (o hoc)). hieu van bao luc tan thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((((o hai) OR (o lai))) 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 lai))) or (o hoc)). hieu van bao luc tan thanh vai cua tre*.