Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam trung
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
nam tu » nam thu, nam thuc
vi cua » di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang x hoi. hieu van ((nam truc) or (nam tu)) van hanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x hoi. hieu van ((nam truc) OR (nam tu)) van hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang x hoi. hieu van ((nam truc) or (nam tu)) van hanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x hoi. hieu van ((nam truc) or (nam tu)) van hanh ((vi cua) OR (vai cua)) triet*.