Perhaps you should try some spelling variations:
doanh khoan » doanh hoan, doanh nhan, doanh phan
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
sach tranh » canh tranh
doanh khoa » toan khoa
khoi phong » khoi khong, khi phong, hai phong
sach tren » sach tien
tranh que » tranh cua, tran quy, thanh qui
que doanh » cua doanh, de doanh, muc doanh
khoa khoi » khoa hoi, khoa khoa, thoat khoi
he doanh » de doanh, te doanh, hoa doanh
tu sach » thu sach, su sach, te sach
tren he » trien he, tren het, tren xe

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tren he doanh khoan phai thong ) or ( tu sach tranh que doanh khoa khoi phong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren he doanh khoan phai thong ) OR ( tu sach tranh que doanh khoa khoi phong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren he doanh khoan phai thong ) or ( tu sach tranh que doanh khoa khoi phong ))*.