Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ban bo » ban do, ban co, ben bo
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu van ((ban bo) OR (can bo)) van hanh ((vi cua) OR (di cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu van ((ban bo) OR (can bo)) van hanh ((vi cua) or (di cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu van ((ban bo) OR (can bo)) van hanh ((vi cua) or (di cua)) triet*.