Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van coc » van hoc, van loc, van co
su bac » xu bac, du bac, su cac
bac ky » cac ky, ban ky, sac ky
luc va » tuc va, loc va
doi ve » moi ve, doi va, noi 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 bac ky tang xa hoi. hieu van coc ((luc va) or (duc va)) thanh doi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su bac ky tang xa hoi. hieu van coc ((luc va) OR (duc va)) thanh doi ve triet.
• Adding a wildcard symbol may retrieve word variants: su bac ky tang xa hoi. hieu van coc ((luc va) or (duc va)) thanh doi ve triet*.