Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hang » ngan hang
nang ma » tang ma, sang ma, nang cao
hieu de » hieu ve, hieu he, hieu le
dao duc » giao duc, tao duoc
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
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 sach ky nang ma hoi. hieu de dao duc ((ban hang) or (va tinh)) di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu de dao duc ((ban hang) OR (va tinh)) di ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu de dao duc ((ban hang) or (va tinh)) di ((cua tre) OR (cua triet))*".