Perhaps you should try some spelling variations:
tranh nghien » trinh nghien, tron nghien, trong nghien
sach doanh » sach danh, sach tranh, cac doanh
nghiep cua » nghiep vua, nghiep luan, nghien cuu
bach tranh » sach tranh, canh tranh, bac thanh
nghien de » nghiem de, nghiep ke, nghiem d
so sach » so sanh, bo sach, co sach
cua hoc » cua hoi, cua thuoc, cua nuoc
de hoc » te hoc, du hoc, dien 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 cua hoc ) or ( vu bach tranh nghien de hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach doanh nghiep cua hoc ) OR ( vu bach tranh nghien de hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach doanh nghiep cua hoc ) or ( vu bach tranh nghien de hoc ))*.