Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
van lam » van nam
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
lam tu » nam tu, cam tu, dam tu

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

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