Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
nghiep chan » nghiep thanh, nghiep luan, nghiep cua
sach doanh » sach danh, sach tranh, cac doanh
can trinh » can tranh, dan trinh, van trinh
quang hoc » quang hoi, quang huy, dung hoc
chan hoc » chat hoc, nhan hoc, than hoc
luan hoc » luan hoan, luan khoa, luan thuc
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 chan hoc ) or ( tu can trinh nghien ((luan hoc) OR (quang hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach doanh nghiep chan hoc ) OR ( tu can trinh nghien ((luan hoc) OR (quang hoc)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach doanh nghiep chan hoc ) or ( tu can trinh nghien ((luan hoc) OR (quang hoc)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach doanh nghiep chan hoc ) or ( tu can trinh nghien ((luan hoc) OR (quang hoc)) ))*.