Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
so viet » hoc viet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
nam tu » nam thu, nam thuc
x hoi » xa hoi, o hoi, x ho
ve so » ve su, va so, ve co

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: vu sac ky nang x hoi. ((hieu van) OR (thien van)) nam tu ((va hanh) OR (va danh)) ve so viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang x hoi. ((hieu van) OR (thien van)) nam tu ((va hanh) or (va danh)) ve so viet~".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang x hoi. ((hieu van) OR (thien van)) nam tu ((va hanh) or (va danh)) ve so viet*.