Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua triet » cua viet, su triet, va triet
hanh vii » hanh voi, hanh va, hanh noi
nien cac » vien cac, dien cac, bien cac
ky dang » ky nang, ky danh
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
ky tang » ky nang, kho tang, ky trong
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky tang) OR (ky dang)) xa hoi. thieu nien cac luc van ((hanh vii) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky tang) OR (ky dang)) xa hoi. thieu nien cac luc van ((hanh vii) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky tang) OR (ky dang)) xa hoi. thieu nien cac luc van ((hanh vii) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky tang) OR (ky dang)) xa hoi. thieu nien cac luc van ((hanh vii) or (hanh vi)) cua triet*.