Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
ky lang » ky dang, ky tang, tay lang
va hanh » va thanh, va danh, ban hanh
tu sac » tu sach, tu cac, tu san
vi su » va su, ve su, ki su

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 lang) OR (ky nang)) xa hoi. hieu van nam thuc ((va hanh) OR (van hanh)) vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky lang) OR (ky nang)) xa hoi. hieu van nam thuc ((va hanh) or (van hanh)) vi su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky lang) OR (ky nang)) xa hoi. hieu van nam thuc ((va hanh) or (van hanh)) vi su triet*.