Perhaps you should try some spelling variations:
doanh nghien » doanh nghiep, doanh nghi, doanh ngiep
sach doanh » sach danh, cac doanh, san doanh
sach tranh » canh tranh
nghiem de » nghiem d, nghiem do, nghiem te
nghien d » nghiem d, nghien o, nghiem do
so sach » so sanh, bo sach, co sach
cuu hoc » cua hoc, cuu thuoc, cuu khoa
vu sach » vu bach, su sach, vu khach

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) OR (nghiem de)) 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) OR (nghiem de)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach doanh nghien cuu hoc ) or ( vu sach tranh ((nghien d) OR (nghiem de)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach doanh nghien cuu hoc ) or ( vu sach tranh ((nghien d) OR (nghiem de)) hoc ))*.