Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren

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

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