Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu nang » thi nang, thu hang, thu bang
cua viet » ca viet, hoa viet, cua dieu
va doanh » van doanh, vay doanh, va danh
sach thu » sach thue, sach thieu, sach tham
cao duc » dao duc, cao suc, giao duc
te sach » toc sach
hieu va » lieu va, hieu qua
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
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 thu nang ((mai hoi) or (dai hoi)). hieu va cao duc va doanh van ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang ((mai hoi) OR (dai hoi)). hieu va cao duc va doanh van ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang ((mai hoi) or (dai hoi)). hieu va cao duc va doanh van ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang ((mai hoi) or (dai hoi)). hieu va cao duc va doanh van ((cua viet) OR (cua vat))*.