Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
luoc dai » cuoc doi, hoc dai, duc dai
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa

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