Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
thi nang » thi cong, ki nang, thi hanh
danh vai » danh sai, danh va, dang van
sach thi » sach thu, sach tai, sach thieu
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
hieu va » lieu va, hieu qua
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thi nang ((mai hoi) OR (lai hoi)). hieu va cao duc va ((danh vai) or (doanh van)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi nang ((mai hoi) OR (lai hoi)). hieu va cao duc va ((danh vai) OR (doanh van)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi nang ((mai hoi) OR (lai hoi)). hieu va cao duc va ((danh vai) or (doanh van)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach thi nang ((mai hoi) OR (lai hoi)). hieu va cao duc va ((danh vai) or (doanh van)) cua triet*.