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

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