Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hang tai » hang va, dung tai
tai khoi » tai khoa, mai khoi, tao khoi
cua viet » ca viet, hoa viet, cua vat
ky hang » ky nang, ly hang, ky dang
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su cao » cu cao, vu cao, su co
le nam » ly nam, he nam, le na
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cao ky hang tai khoi. hieu le nam thuoc ((va hanh) or (va danh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cao ky hang tai khoi. hieu le nam thuoc ((va hanh) OR (va danh)) di cua viet.
• Adding a wildcard symbol may retrieve word variants: su cao ky hang tai khoi. hieu le nam thuoc ((va hanh) or (va danh)) di cua viet*.