Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tang tai » hang tai, dung tai, sang tao
ky tang » ky nang, ky dang, kho tang
tai hoi » tai khoi, dai hoi, tai hai
hieu vu » hieu va, hieu su, dieu vu
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
tu san » thu san, tu ban, tu can
vi cua » di cua
xu van » tu van, vu van, su van
san ky » sang ky, van ky, dan ky

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 tang tai hoi. ((hieu vu) or (hieu ve)) chao xu van hanh ((vi cua) OR (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky tang tai hoi. ((hieu vu) OR (hieu ve)) chao xu van hanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky tang tai hoi. ((hieu vu) or (hieu ve)) chao xu van hanh ((vi cua) OR (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu san ky tang tai hoi. ((hieu vu) or (hieu ve)) chao xu van hanh ((vi cua) OR (vai cua)) te*.