Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc van » thuoc va, thuc van, thuoc ban
chua tre » chua tri, cua tre, chua trieu
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
hieu ly » hieu ky, lieu ly, dieu ly
va chua » vua chua, ca chua, va chu
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu le » hieu ve, hieu he, tieu le
nang xa » nang x, lang xa, nang ma

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 ky ((nang xa) or (dang xay)) hoi. ((hieu le) or (hieu ly)) nam thuoc van hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (dang xay)) hoi. ((hieu le) OR (hieu ly)) nam thuoc van hanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (dang xay)) hoi. ((hieu le) or (hieu ly)) nam thuoc van hanh va chua tre*.