Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
cua viet » ca viet, cua vat, cua dieu
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
danh vi » hanh vi, dinh vi, danh di
su sac » su sach, su cac, su xac
cam tu » cam thu, nam tu, dam tu
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang mai khoi. hieu ve ((nam thuoc) or (cam tu)) va danh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang mai khoi. hieu ve ((nam thuoc) OR (cam tu)) va danh vi ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sac ky nang mai khoi. hieu ve ((nam thuoc) or (cam tu)) va danh vi ((cua viet) or (hoa viet))*.