Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu de » hieu ve, hieu he, hieu le
dao duc » giao duc, tao duoc
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach y) or (sac ky)) nang xa hoi. hieu de dao duc va hanh dai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sac ky)) nang xa hoi. hieu de dao duc va hanh dai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach y) or (sac ky)) nang xa hoi. hieu de dao duc va hanh dai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sac ky)) nang xa hoi. hieu de dao duc va hanh dai ((cua triet) OR (va triet))*.