Perhaps you should try some spelling variations:
sach doanh » sach danh, cac doanh, san doanh
nghiep vua » nghiep va, nghiep vu
sach tranh » canh tranh
nghien d » nghiem d, nghiem de, nghiem do
nghien o » nghiep o, nghiep so, nghiep co
co sach » bo sach, cuon sach, hoc sach
vua hoc » va hoc, cua hoc, luan hoc
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: (( co sach doanh nghiep vua hoc ) or ( vu sach tranh ((nghien d) or (nghien o)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( co sach doanh nghiep vua hoc ) OR ( vu sach tranh ((nghien d) OR (nghien o)) hoc )).
• Adding a wildcard symbol may retrieve word variants: (( co sach doanh nghiep vua hoc ) or ( vu sach tranh ((nghien d) or (nghien o)) hoc ))*.