Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh dan » thanh san, thanh van, thanh dam
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
ma hoi » mai hoi, ma hoa, me hoi
ve nam » he nam, va nam, le nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky sang ((ma hoi) OR (xa hoi)). hieu ve nam thuoc va ((thanh dan) OR (thanh dat)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky sang ((ma hoi) or (xa hoi)). hieu ve nam thuoc va ((thanh dan) OR (thanh dat)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky sang ((ma hoi) or (xa hoi)). hieu ve nam thuoc va ((thanh dan) OR (thanh dat)) cua tre*.