Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
ban thanh » ban hanh, ban hang
thanh ly » thanh lay, thanh ky, thanh le
cao duc » dao duc, giao duc, tao duoc
cao suc » cao su
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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. ((hieu va) or (lieu va)) ((cao duc) OR (cao suc)) ban thanh ly chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. ((hieu va) OR (lieu va)) ((cao duc) OR (cao suc)) ban thanh ly chat triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. ((hieu va) or (lieu va)) ((cao duc) OR (cao suc)) ban thanh ly chat triet*".