Perhaps you should try some spelling variations:
giai nghiep » mai nghiep, giai nghia
xay nghiem » xet nghiem, day nghiep, van nghiem
nghiep bai » nghiep tai, nghiep bao, nghiep bac
sach giai » sach giao, cac giai, sach bai
tu sach » thu sach, su sach, te sach
bai hoc » dai hoc
su hoc » tu hoc, du hoc, su ho
so hoc » co hoc, mo hoc, so hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach xay nghiem ((su hoc) OR (so hoc)) ) OR ( tu sach giai nghiep bai hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (( thu hoach xay nghiem ((su hoc) or (so hoc)) ) or ( tu sach giai nghiep bai hoc ))*.