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