Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
chat huu » pham huu
va doanh » van doanh, vay doanh, va danh
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va chat » van chat, va phat, cao chat
than va » thanh va, nhan va, toan va
huu va » cuu va, tuu va

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 ty nang ((mai khoi) or (cac khoi)). lieu va chat huu va doanh than va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((mai khoi) OR (cac khoi)). lieu va chat huu va doanh than va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((mai khoi) or (cac khoi)). lieu va chat huu va doanh than va triet*.