Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
thu va » thuc va, thue va, tu va
thiet » thieu

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

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