Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
danh lai » danh sai, gianh lai, dinh lam
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
tai hoi » tai khoi, tai hai, tai hoe
dai hoi » dai hoc, dai hai, dai moi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky sang ((tai hoi) or (dai hoi)). hieu van ((nam thuoc) or (cam xuc)) va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang ((tai hoi) OR (dai hoi)). hieu van ((nam thuoc) OR (cam xuc)) va danh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ((tai hoi) or (dai hoi)). hieu van ((nam thuoc) or (cam xuc)) va danh lai cua tre*.