Perhaps you should try some spelling variations:
lai thien » cai thien, li thien, bui thien
thanh lap » thanh san, phan lap, thanh hai
sach thu » sach thue, sach thieu, sach tham
hanh lam » hanh kem, hanh va, dinh lam
cao duc » dao duc, cao suc, giao duc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, trung ha
ve cao » va cao, ve bao, ve cac

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