Perhaps you should try some spelling variations:
sanh trong » sinh trong, anh trong, hanh trong
sach doanh » sach danh, sach tranh, cac doanh
nghiep tu » nghiep vu, nghiep vua, nghiep cua
sach tron » sach tren, sach tranh, sach tien
nghien o » nghiep o, nghiep so, nghiep co
so sach » so sanh, bo sach, co sach
tu hoc » te hoc
o hoc » co hoc, mo hoc, so hoc

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 doanh nghiep tu hoc ) or ( su ((sach tron) or (sanh trong)) nghien o hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach doanh nghiep tu hoc ) OR ( su ((sach tron) OR (sanh trong)) nghien o hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach doanh nghiep tu hoc ) or ( su ((sach tron) or (sanh trong)) nghien o hoc ))*.