Perhaps you should try some spelling variations:
doanh phan » doanh nhan, doan phan, doanh thanh
doanh than » doanh thanh, doanh nhan, doanh tai
cua triet » cua viet, su triet, va triet
van chat » cao chat
chat huu » pham huu
hieu van » hieu va, thien van, lieu va
nang mai » nang ma, nang tai, lang mai
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
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 hoi. hieu van chat huu va ((doanh than) or (doanh phan)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang mai hoi. hieu van chat huu va ((doanh than) OR (doanh phan)) cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang mai hoi. hieu van chat huu va ((doanh than) or (doanh phan)) cua triet*.