Perhaps you should try some spelling variations:
van trien » van tien, va trien, van tren
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
dau hoc » du hoc, dan hoc, day hoc
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
luc ban » duc ban, cuc ban, luc bat
hanh va » hang va, hanh vi
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky

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 ((dau hoc) OR (dai hoc)). hieu van cau luc ban hanh va van trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((dau hoc) OR (dai hoc)). hieu van cau luc ban hanh va van trien".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((dau hoc) OR (dai hoc)). hieu van cau luc ban hanh va van trien*.