Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
kho tang » cao tang
van cau » van dau, van hau, van chat
van cac » van hac, van bac, dan cac
ky tang » ky nang, ky dang, ky trong
luc va » duc va, tuc va, loc va
doi su » oi su, don su, voi su
su sai » su tai, su hai, su dai

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 tang) OR (kho tang)) xa hoi. hieu ((van cac) or (van cau)) luc va thanh doi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ((ky tang) OR (kho tang)) xa hoi. hieu ((van cac) OR (van cau)) luc va thanh doi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((ky tang) OR (kho tang)) xa hoi. hieu ((van cac) or (van cau)) luc va thanh doi su triet".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky tang) OR (kho tang)) xa hoi. hieu ((van cac) or (van cau)) luc va thanh doi su triet*.