Perhaps you should try some spelling variations:
vai trien » va trien, cai thien, cai tien
nang dai » nang dau, nang tai, lang dai
hieu van » hieu va, thien van, lieu va
hau luc » cau luc, nhan luc, hieu luc
hau loc » huu loc, phau hoc
va hanh » van hanh, va thanh, ban hanh
hanh va » hang va, hanh vi
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
va vai » va bai, va van, va dai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang dai hoc. hieu van ((hau luc) OR (hau loc)) va hanh va vai trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang dai hoc. hieu van ((hau luc) OR (hau loc)) va hanh va vai trien".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang dai hoc. hieu van ((hau luc) OR (hau loc)) va hanh va vai trien*.