Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duc manh » suc manh, duc anh, duc minh
hang dai » hoang dai, hang tai, hang dau
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc phan

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 nang ((van hoi) OR (van hoc)). hieu va cac ((duc van) or (duc manh)) hang dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky nang ((van hoi) OR (van hoc)). hieu va cac ((duc van) OR (duc manh)) hang dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang ((van hoi) OR (van hoc)). hieu va cac ((duc van) or (duc manh)) hang dai cua triet".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang ((van hoi) OR (van hoc)). hieu va cac ((duc van) or (duc manh)) hang dai cua triet*.