Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
ban thanh » ban hang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
sach ty » sach y, sach tu, sach thu
van lam » van nam
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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 ty) or (sac ky)) nang x ho. hieu van lam thuoc ((ban thanh) or (ban hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang x ho. hieu van lam thuoc ((ban thanh) OR (ban hanh)) lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang x ho. hieu van lam thuoc ((ban thanh) or (ban hanh)) lai cua tre*.