Perhaps you should try some spelling variations:
tranh nghien » trinh nghien, tron nghien, trong nghien
doanh nghien » doanh nghiep, doanh nghi, doanh ngiep
sach doanh » sach danh, cac doanh, san doanh
sach tranh » canh tranh
nghien d » nghiem d, nghien o, nghiem de
so sach » so sanh, bo sach, co sach
cuu hoc » cua hoc, cuu thuoc, cuu khoa
vu sach » vu bach, su sach, vu khach
d hoc » du hoc, ad hoc, de 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 nghien cuu hoc ) or ( vu sach tranh nghien d hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach doanh nghien cuu hoc ) OR ( vu sach tranh nghien d hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach doanh nghien cuu hoc ) or ( vu sach tranh nghien d hoc ))*.