Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sang kyo » sang ky, sang tao, dang ky
kyo nang » ky nang, khoi nang, ki nang
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
tu sang » thu sang, tu san, tu lang
nang ma » tang ma, sang ma, nang cao
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
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: tu sang kyo nang ma hoi. hieu van ((cam tu) or (dam tu)) va hanh vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang kyo nang ma hoi. hieu van ((cam tu) OR (dam tu)) va hanh vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sang kyo nang ma hoi. hieu van ((cam tu) or (dam tu)) va hanh vi ((cua tre) or (su triet))*.