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 dang, kho tang, ky trong
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
luc gia » luoc gia, duc gia, quoc gia
su sac » su sach, su cac, su xac
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) OR (ky nang)) xa hoi. hieu van cac luc gia thanh doi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) OR (ky nang)) xa hoi. hieu van cac luc gia thanh doi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) OR (ky nang)) xa hoi. hieu van cac luc gia thanh doi ve triet*.