Perhaps you should try some spelling variations:
lai thien » cai thien, li thien, bui thien
sach thu » sach thue, sach thieu, sach tham
hanh lam » thanh lap, hanh kem, hanh va
lam lai » lam tai, lay lai, lam lam
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
ve cao » va cao, ve bao, ve cac
ha hoi » hoa hoi, ha noi, va hoi

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 y) or (sach thu)) lang ((ha hoi) OR (xa hoi)). hieu ve cao duc va hanh lam lai thien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sach thu)) lang ((ha hoi) OR (xa hoi)). hieu ve cao duc va hanh lam lai thien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sach thu)) lang ((ha hoi) OR (xa hoi)). hieu ve cao duc va hanh lam lai thien".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sach thu)) lang ((ha hoi) OR (xa hoi)). hieu ve cao duc va hanh lam lai thien*.