Perhaps you should try some spelling variations:
thien van » thi van
thanh doi » thanh loi, thanh moi, thanh do
hieu van » hieu va, lieu va, hieu ve
ve triet » va trien, su triet
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
loc va » hoc va, luc 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 sac ky tang xa hoi. ((hieu van) OR (thien van)) coc ((loc va) or (duc va)) thanh doi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. ((hieu van) OR (thien van)) coc ((loc va) OR (duc va)) thanh doi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. ((hieu van) OR (thien van)) coc ((loc va) or (duc va)) thanh doi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. ((hieu van) OR (thien van)) coc ((loc va) or (duc va)) thanh doi ve triet*.