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, san doanh
vay doanh » van doanh, ly doanh, voi doanh
nghiep tu » nghiep vu, nghiep vua, nghiep cua
nghien ad » nghiem d, nghien o, nghiep a
vu sach » vu bach, su sach, vu khach
tu hoc » te 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 (vay doanh)) nghiep tu hoc ) or ( vu sach tranh nghien ad hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so ((sach doanh) OR (vay doanh)) nghiep tu hoc ) OR ( vu sach tranh nghien ad hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so ((sach doanh) or (vay doanh)) nghiep tu hoc ) or ( vu sach tranh nghien ad hoc ))*.