Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
te sach » toc sach
tai cua » thai cua, tai cuc, tri cua
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tu nang » tru nang, tu nong, tu nano
ve cam » ve cham, ve cac, va cam
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu nang ((o hoi) or (o hai)). hieu ve cam xuc ((van hanh) OR (van thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang ((o hoi) OR (o hai)). hieu ve cam xuc ((van hanh) OR (van thanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang ((o hoi) or (o hai)). hieu ve cam xuc ((van hanh) OR (van thanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang ((o hoi) or (o hai)). hieu ve cam xuc ((van hanh) OR (van thanh)) tai cua tre*.