Perhaps you should try some spelling variations:
nghien luan » nghiep luan, nghiep quan, ngheo luan
sach doanh » sach danh, sach tranh, cac doanh
nghiep dai » nghiep tai, nghiep bai, nghiep va
can trinh » can tranh, dan trinh, cong trinh
van trinh » van thinh, van tinh, dan trinh
luan hoc » luan hoan, quang hoc, luan khoa
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach doanh nghiep dai hoc ) or ( tu ((can trinh) or (van trinh)) nghien luan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach doanh nghiep dai hoc ) OR ( tu ((can trinh) OR (van trinh)) nghien luan hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach doanh nghiep dai hoc ) or ( tu ((can trinh) or (van trinh)) nghien luan hoc ))*.