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