Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, chet duoc
trai ky » thai ky
duc van » duc va, duc tan, duc manh
su trai » sau trai, su tai, su tri
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve chat » va chat, van chat
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su trai ky nang ((ma hoi) or (mai hoi)). hieu ve chat duc van hanh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su trai ky nang ((ma hoi) OR (mai hoi)). hieu ve chat duc van hanh vi ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su trai ky nang ((ma hoi) or (mai hoi)). hieu ve chat duc van hanh vi ((cua triet) or (va triet))*.