Perhaps you should try some spelling variations:
thuoc van » thuoc va, thuc van, thuoc ban
nam thuoc » nam thuc, nam thu, nha thuoc
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
hieu le » hieu he, hieu ly, tieu le
hieu ve » hieu va, hieu van
va cua » va chua, via cua, ca cua
tu sac » tu sach, tu cac, tu san
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 sac ky ((nang xa) or (dang xay)) hoi. ((hieu le) OR (hieu ve)) nam thuoc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (dang xay)) hoi. ((hieu le) OR (hieu ve)) nam thuoc van hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (dang xay)) hoi. ((hieu le) OR (hieu ve)) nam thuoc van hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (dang xay)) hoi. ((hieu le) OR (hieu ve)) nam thuoc van hanh va cua tre*.