Perhaps you should try some spelling variations:
tien nghiem » trien nghiep, kiem nghiem, bien nghien
vien nghien » lieu nghien
thuc nghiem » trac nghiem
cach thuc » anh thuc, cac thu
nghiem ad » nghiem d, nghiem ban, nghiem lam
thu cach » thuc cach, thu canh, tu cach
su sach » so sach, vu sach
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: (( su sach ((tien nghiem) OR (vien nghien)) de hoc ) or ( thu cach thuc nghiem ad hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach ((tien nghiem) OR (vien nghien)) de hoc ) OR ( thu cach thuc nghiem ad hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach ((tien nghiem) OR (vien nghien)) de hoc ) or ( thu cach thuc nghiem ad hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach ((tien nghiem) OR (vien nghien)) de hoc ) or ( thu cach thuc nghiem ad hoc ))*.