Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
van lam » van nam
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu van lam thuc ((va thanh) or (ban thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu van lam thuc ((va thanh) OR (ban thanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu van lam thuc ((va thanh) or (ban thanh)) tai cua tre*.