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

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 ((nam thu) or (nam thuoc)) van hanh va cao 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 ((nam thu) OR (nam thuoc)) van hanh va cao viet.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang ((le hoi) or (ma hoa)). hieu le ((nam thu) or (nam thuoc)) van hanh va cao viet*.