Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
sach kem » hanh kem
ban dinh » ban tinh, van dinh, ban dich
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
dinh vi » dinh ve, dinh viet, dinh tri
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
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 kem) or (sac ky)) nang xa hoi. hieu van nam thuoc ban dinh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang xa hoi. hieu van nam thuoc ban dinh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang xa hoi. hieu van nam thuoc ban dinh vi ((cua tre) or (cuu tre))*.