Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
ca viet » va viet, co viet, hoa viet
va hanh » van hanh, va thanh, va danh
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
hieu he » hieu ve, hiem he, hieu le
va dan » ca dan, va dao, va dau
su sac » su sach, su cac, su xac
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam
di ca » di cau, di cua, doi ca

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 sang) OR (ky dang)) ma hoi. hieu he nam thuoc ((va hanh) or (va dan)) di ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky sang) OR (ky dang)) ma hoi. hieu he nam thuoc ((va hanh) OR (va dan)) di ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky sang) OR (ky dang)) ma hoi. hieu he nam thuoc ((va hanh) or (va dan)) di ca viet".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky sang) OR (ky dang)) ma hoi. hieu he nam thuoc ((va hanh) or (va dan)) di ca viet*.