Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
dung sai » dung tai, dung va, dung dat
danh sai » danh bat, danh dau, hanh san
nam thuc » am thuc, nam thu, nam tu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu he » hieu ve, hiem he, hieu le
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang xa hoi. hieu he ((nam thuc) OR (nam thuoc)) xa ((danh sai) or (dung sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang xa hoi. hieu he ((nam thuc) OR (nam thuoc)) xa ((danh sai) OR (dung sai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang xa hoi. hieu he ((nam thuc) OR (nam thuoc)) xa ((danh sai) or (dung sai)) cua tre*".