Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
luc tan » luc tai, duc tan, luc tam
van bao » van ban, van dao
bao luc » bao thuc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
so hoc » co hoc, mo hoc, so hoa
o hoi » co hoi, o hoc, o 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 hoi) or (so hoc)). hieu van bao luc tan ((thanh van) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoi) OR (so hoc)). hieu van bao luc tan ((thanh van) OR (thanh hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoi) or (so hoc)). hieu van bao luc tan ((thanh van) or (thanh hai)) cua tre*.