Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
hieu vu » hieu va, hieu ve, hieu su
va hanh » van hanh, va thanh, va danh
ky tang » ky nang, ky dang, kho tang
dai hoi » dai hai, dai moi
vu chat » va chat, ve chat, du chat
tu sac » tu sach, tu cac, tu bac
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
cua te » cua tu
tu san » thu san, tu ban, tu can

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