Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nang noi » nang doc
va danh » va dinh, va dan, dia danh
noi hoi » noi doi, doi hoi, hoi hoi
hieu va » lieu va
va hanh » van hanh, va thanh, ban hanh
vai su » va su, van su, lai su
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang noi hoi. ((hieu va) OR (hieu qua)) am thuc ((va danh) OR (va hanh)) vai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang noi hoi. ((hieu va) or (hieu qua)) am thuc ((va danh) OR (va hanh)) vai su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang noi hoi. ((hieu va) or (hieu qua)) am thuc ((va danh) OR (va hanh)) vai su triet*.