Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh ghep
nghiep luan » nghiep vua
sach doanh » sach danh, sach tranh, cac doanh
ban trinh » ban tinh, dan trinh, van trinh
khoa hoc » hoa hoc
luan hoc » luan hoan, quang hoc, luan khoa
tu sach » thu sach, su sach, te sach
hoi hoc » hoa hoc, hoi chuc
tu ban » thu ban, te ban

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 ((hoi hoc) OR (khoa hoc)) ) or ( tu ban trinh nghiep luan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach doanh nghiep ((hoi hoc) OR (khoa hoc)) ) OR ( tu ban trinh nghiep luan hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach doanh nghiep ((hoi hoc) OR (khoa hoc)) ) or ( tu ban trinh nghiep luan hoc ))*".