Perhaps you should try some spelling variations:
sach phan » sach han, mach phan, sach phat
sac doanh » cac doanh, san doanh, sam doanh
phan cong » thanh cong
doanh co » doanh cua, doanh va, anh co
su sach » so sach, vu sach
cong ha » cong hoa, dong ha, cong tac
su sac » su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sac doanh co khi đong luc ) or ( su sach phan cong ha đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sac doanh co khi đong luc ) OR ( su sach phan cong ha đong luc ))*.