Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
ban hang » ngan hang
sach ky » sac ky, sach y, sach ty
hang ly » huong ly
cao duc » dao duc, cao suc, giao duc
cao dua » ca dua, cay dua, cao quan
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hoi) OR (o hai)). hieu va ((cao dua) or (cao duc)) ban hang ly chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). hieu va ((cao dua) OR (cao duc)) ban hang ly chat triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) OR (o hai)). hieu va ((cao dua) or (cao duc)) ban hang ly chat triet*".