Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
ban dinh » ban tinh, van dinh, ban dich
qua cham » qua hai, qua cac, va cham
cham cuu » cap cuu, chat cua
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
cuu ban » cuu van, cua ban, cuu san
dinh vi » dinh ve, dinh viet, dinh tri
ky lang » ky nang, ky dang, tay lang
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky lang) OR (ky tang)) van hoi. hieu qua cham cuu ban dinh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) van hoi. hieu qua cham cuu ban dinh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky tang)) van hoi. hieu qua cham cuu ban dinh vi ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky tang)) van hoi. hieu qua cham cuu ban dinh vi ((cua triet) or (va triet))*.