Perhaps you should try some spelling variations:
tranh nghien » trinh nghien, tron nghien, trong nghien
sach tranh » canh tranh
sach doanh » sach danh, cac doanh, hanh doanh
san doanh » van doanh, toan doanh, vay doanh
nghiep tu » nghiep vu, nghiep vua, nghiep cua
nghien d » nghiem d, nghien o, nghiem de
vu sach » vu bach, su sach, vu khach
tu hoc » te hoc
d hoc » du hoc, ad hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so ((sach doanh) OR (san doanh)) nghiep tu hoc ) or ( vu sach tranh nghien d hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so ((sach doanh) OR (san doanh)) nghiep tu hoc ) OR ( vu sach tranh nghien d hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so ((sach doanh) OR (san doanh)) nghiep tu hoc ) or ( vu sach tranh nghien d hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( so ((sach doanh) OR (san doanh)) nghiep tu hoc ) or ( vu sach tranh nghien d hoc ))*.