Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
hieu van » hieu va, thien van, lieu va
cach tu » cach thuc
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh

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 ty) or (cach tu)) nang xa hoi. hieu van cao duc va hanh vi ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (cach tu)) nang xa hoi. hieu van cao duc va hanh vi ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (cach tu)) nang xa hoi. hieu van cao duc va hanh vi ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (cach tu)) nang xa hoi. hieu van cao duc va hanh vi ((va triet) OR (ve triet))*.