Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, cua triet
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
dau duoc » da duoc, dat duoc, dau nuoc
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
van dau » van dao, phan dau
sach ky » sach y, sach ty, sach kem
hanh va » hang va, hanh vi
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: toc ((sach ky) or (sac ky)) nang xa hoi. hieu van dau duoc van hanh va ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sac ky)) nang xa hoi. hieu van dau duoc van hanh va ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sac ky)) nang xa hoi. hieu van dau duoc van hanh va ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sac ky)) nang xa hoi. hieu van dau duoc van hanh va ((va triet) OR (ve triet))*.