Perhaps you should try some spelling variations:
doanh khuan » doanh khoa, doanh nhan, doanh luan
khoa thong » hoa thong, thoai thong, pho thong
tri truoc » tri thuoc, tri thuc, gi truoc
truoc cac » truoc cach, truoc cang, truoc cuoc
sach thi » sach thu, sach tai, sach thieu
sach tri » sach tai, sach tren, sach truc
cac khoa » cac khoan, cac khoi, dac khoa
so sach » so sanh, bo sach, co sach
thi tri » thi tra, thi thi, thi trinh
khoa he » hoa he, khoa hoc, khong he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach thi tri doanh khuan khoa thong ) or ( so sach tri truoc cac khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach thi tri doanh khuan khoa thong ) OR ( so sach tri truoc cac khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach thi tri doanh khuan khoa thong ) or ( so sach tri truoc cac khoa he thong ))*.