Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
nghiep luan » nghiep vua
sach doanh » sach danh, sach tranh, cac doanh
luan khoa » khuan khoa, toan khoa, luan hoan
can trinh » can tranh, dan trinh, van trinh
quang hoc » quang hoi, quang huy, nang hoc
dung hoc » dong hoc, dung thuoc, trung hoc
tu sach » thu sach, su sach, te sach
tu can » tu ban, tu cac, thu canh

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 luan khoa ) or ( tu can trinh nghien ((quang hoc) OR (dung hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach doanh nghiep luan khoa ) OR ( tu can trinh nghien ((quang hoc) OR (dung hoc)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach doanh nghiep luan khoa ) or ( tu can trinh nghien ((quang hoc) OR (dung hoc)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach doanh nghiep luan khoa ) or ( tu can trinh nghien ((quang hoc) OR (dung hoc)) ))*.