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 » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
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

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 (tay hoi)). hieu ve dao duc va hanh vai va (thiet OR thieu)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach le thanh ((xay hoi) OR (tay hoi)). hieu ve dao duc va hanh vai va (thiet OR thieu).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le thanh ((xay hoi) or (tay hoi)). hieu ve dao duc va hanh vai va (thiet OR thieu)".
• Adding a wildcard symbol may retrieve word variants: su sach le thanh ((xay hoi) or (tay hoi)). hieu ve dao duc va hanh vai va (thiet OR thieu)*.