Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
su sai » su tai, su hai, su dai
sai ky » sac ky
ma hoi » xa hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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 nang ((ma hoi) or (mai hoi)). hieu ve cac ((duc van) or (duc va)) hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((ma hoi) OR (mai hoi)). hieu ve cac ((duc van) OR (duc va)) hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((ma hoi) or (mai hoi)). hieu ve cac ((duc van) or (duc va)) hanh dai cua triet*.