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

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) OR (lang 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) OR (lang xa)) hoi. hieu van lam thuc ((va thanh) OR (ban thanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) OR (lang 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) OR (lang xa)) hoi. hieu van lam thuc ((va thanh) or (ban thanh)) tai cua tre*.