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

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) OR (nam tu)) va hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ma hoi. hieu van ((lam tu) OR (nam tu)) va hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ma hoi. hieu van ((lam tu) OR (nam tu)) va hanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ma hoi. hieu van ((lam tu) OR (nam tu)) va hanh vi ((cua tre) or (cua triet))*.