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