Perhaps you should try some spelling variations:
tranh nghiem » trac nghiem, trinh nghien, trai nghiem
tranh nghiep » doanh nghiep, trinh nghien, trac nghiem
trach nhiem » trac nghiem
sach tranh » canh tranh
nghiep tu » nghiep vu, nghiep vua, nghiep cua
co sach » bo sach, cuon sach, hoc sach
vu sach » vu bach, su sach, vu khach
tu hoc » te hoc
de hoc » te hoc, du hoc, dien hoc

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

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