Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach le » cach le, sach de, sach lo
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
dao duc » giao duc, tao duoc
va hanh » van hanh, va thanh, va danh
ve dao » de dao, va dao, ve bao
vai va » mai va, dai va, hai 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 le thanh ((xay hoi) OR (xa hoi)). hieu ve dao duc va hanh vai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le thanh ((xay hoi) OR (xa hoi)). hieu ve dao duc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach le thanh ((xay hoi) OR (xa hoi)). hieu ve dao duc va hanh vai va thiet*.