Perhaps you should try some spelling variations:
doanh cua » doanh luan
ve triet » va trien, su triet
va doanh » van doanh, vay doanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, hoc sach
hieu ve » hieu van
xang co » nang co, lang co, tang co
co sach » bo sach, cuon sach, hoc sach
co hoi » co hoc, co loi
luc va » duc va, tuc va, loc va
cua ve » cua vi, cua te, cua vu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) ty xang co hoi. ((hieu ve) OR (hieu va)) cam luc va doanh cua ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty xang co hoi. ((hieu ve) OR (hieu va)) cam luc va doanh cua ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) ty xang co hoi. ((hieu ve) OR (hieu va)) cam luc va doanh cua ve triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ty xang co hoi. ((hieu ve) OR (hieu va)) cam luc va doanh cua ve triet*.