Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
ky tang » ky nang, ky dang, kho tang
dai hoi » dai hai, dai moi
va hanh » van hanh, va thanh, va danh
hieu vu » hieu va, hieu su, dieu vu
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
cua te » cua tu
sac ky » cac ky, sai 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 sac ky tang ((dai hoi) or (dai hoc)). ((hieu vu) OR (hieu ve)) chat luc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang ((dai hoi) OR (dai hoc)). ((hieu vu) OR (hieu ve)) chat luc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky tang ((dai hoi) or (dai hoc)). ((hieu vu) OR (hieu ve)) chat luc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang ((dai hoi) or (dai hoc)). ((hieu vu) OR (hieu ve)) chat luc va hanh vi cua te*.