Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ky dang » ky danh
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
su sai » su tai, su hai, su dai
luc va » duc va, tuc va, loc va
doi ve » doi va, noi ve, do ve

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 ve) OR (moi 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 ve) OR (moi 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 ve) OR (moi 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 ve) OR (moi ve)) triet*.