Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
thanh doi » thanh moi, thanh do, thanh hoai
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
cac luc » cau luc, coc luc, cac nuoc
van cac » van hac, van cau, van bac
ky dang » ky danh
luc va » duc va, tuc va, loc va
su sai » su tai, su hai, su 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 sai ((ky dang) or (ky nang)) xa hoi. hieu van cac luc va ((thanh doi) OR (thanh loi)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ((ky dang) OR (ky nang)) xa hoi. hieu van cac luc va ((thanh doi) OR (thanh loi)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((ky dang) or (ky nang)) xa hoi. hieu van cac luc va ((thanh doi) OR (thanh loi)) ve triet".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky dang) or (ky nang)) xa hoi. hieu van cac luc va ((thanh doi) OR (thanh loi)) ve triet*.