Perhaps you should try some spelling variations:
tham nghiem » trac nghiem, thuc nghiem, thi nghiem
hoach tham » hoac tham, hoach thay, sach tham
dao nghiem » khao nghiem, van nghiem, vao nghien
nghiem dai » nghiep dai, nghiem dau, nghiep tai
sach dao » lanh dao
dau hoc » du hoc, dan hoc, cau hoc
day hoc » dan hoc
su sach » so sach, vu sach

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 tham nghiem ((dau hoc) OR (day hoc)) ) OR ( su sach dao nghiem dai hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu hoach tham nghiem ((dau hoc) OR (day hoc)) ) or ( su sach dao nghiem dai hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( thu hoach tham nghiem ((dau hoc) OR (day hoc)) ) or ( su sach dao nghiem dai hoc ))*.