Perhaps you should try some spelling variations:
thuoc tan » thuoc tai, thuoc ban, thuoc tren
nam thuoc » nam thuc, nam thu, nha thuoc
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
tan anh » tuan anh, tran anh, toan anh
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
anh va » hanh va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (vu bach)) ky ((lang xa) OR (dang xay)) hoi. hieu van nam thuoc tan anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (vu bach)) ky ((lang xa) OR (dang xay)) hoi. hieu van nam thuoc tan anh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (vu bach)) ky ((lang xa) OR (dang xay)) hoi. hieu van nam thuoc tan anh va cua tre*".