Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
van coc » van hoc, van loc, van co
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
luc va » duc va, tuc va
loc va » hoc va
su xac » pu xac, su cac
doi ve » moi ve, doi va, noi ve
su sac » su sach, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) OR (su xac)) ky tang xa hoi. hieu van coc ((luc va) or (loc va)) thanh doi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky tang xa hoi. hieu van coc ((luc va) OR (loc va)) thanh doi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ky tang xa hoi. hieu van coc ((luc va) or (loc va)) thanh doi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su xac)) ky tang xa hoi. hieu van coc ((luc va) or (loc va)) thanh doi ve triet*.