Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dieu tra » dieu tri, kiem tra
va danh » va dinh, va dan, va hanh
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, te sach
va nang » van nang, da nang, cam nang
van cau » van dau, van hau, van chat
luc va » duc va, tuc va, loc va
v nang » vu nang, van nang, voi nang

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 sach ((v nang) OR (va nang)) xa hoi. hieu van cau luc va danh ((dieu cua) OR (dieu tra)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) or (va nang)) xa hoi. hieu van cau luc va danh ((dieu cua) OR (dieu tra)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) or (va nang)) xa hoi. hieu van cau luc va danh ((dieu cua) OR (dieu tra)) triet*.