Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua triet » cua viet, su triet, va triet
thuoc xa » thuoc ma, thuoc va, thuoc la
danh sai » danh bat, danh dau, hanh san
dung sai » dung tai, dung va, dung dat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu he » hieu ve, hiem he, hieu le
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky sang ma hoa. hieu he nam thuoc xa ((danh sai) or (dung sai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoa. hieu he nam thuoc xa ((danh sai) OR (dung sai)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoa. hieu he nam thuoc xa ((danh sai) or (dung sai)) cua triet*.