Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
cua tre » cua te, cuu tre, dua tren
ban anh » ban banh, ban danh, bang anh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky sang ma hoi. hieu va cham duc ((ban anh) or (ban hanh)) doi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky sang ma hoi. hieu va cham duc ((ban anh) OR (ban hanh)) doi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky sang ma hoi. hieu va cham duc ((ban anh) or (ban hanh)) doi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sai ky sang ma hoi. hieu va cham duc ((ban anh) or (ban hanh)) doi ((cua tre) OR (cua triet))*.