Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nhan luc » nang luc
hieu vu » hieu va, hieu ve, hieu su
luc van » luoc van, luu van, duc van
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai roi, mai hoi
lai hoa » dai hoa, loai hoc
vu nhan » cu nhan, vu ngan, tu nhan
di cua » dai cua, doi cua, de cua
vi cua » vai cua
tu san » thu san, tu ban, tu can
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 sang ((lai hoi) or (lai hoa)). hieu vu nhan luc van hanh ((vi cua) OR (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky sang ((lai hoi) OR (lai hoa)). hieu vu nhan luc van hanh ((vi cua) OR (di cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky sang ((lai hoi) or (lai hoa)). hieu vu nhan luc van hanh ((vi cua) OR (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu san ky sang ((lai hoi) or (lai hoa)). hieu vu nhan luc van hanh ((vi cua) OR (di cua)) te*.