Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
doanh van » doan van, doanh ban, doanh nhan
cua triet » cua viet, su triet, va triet
hanh mai » hanh ma, hanh mau, hanh may
doanh va » doan va, doanh tai, doanh cua
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
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 thuc hanh mai hoi. hieu va cao duc va ((doanh van) OR (doanh va)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thuc hanh mai hoi. hieu va cao duc va ((doanh van) OR (doanh va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach thuc hanh mai hoi. hieu va cao duc va ((doanh van) OR (doanh va)) cua triet*.