Perhaps you should try some spelling variations:
thuoc van » thuoc va, thuc van, thuoc ban
nam thuoc » nam thuc, nam thu, nha thuoc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
hieu le » hieu he, hieu ly, tieu le
ky dang » ky nang, ky danh
va ca » va cac, va cao, va cai

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 dang ((le hoi) or (ma hoa)). ((hieu le) OR (hieu ve)) nam thuoc van hanh va ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang ((le hoi) OR (ma hoa)). ((hieu le) OR (hieu ve)) nam thuoc van hanh va ca viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang ((le hoi) or (ma hoa)). ((hieu le) OR (hieu ve)) nam thuoc van hanh va ca viet*".