Perhaps you should try some spelling variations:
thoi nghiem » thi nghiem, khoi nghiep, thuc nghiem
vao nghien » va nghien, tam nghien, dau nghien
cach thoi » cac thoi, cach thuc, cach noi
nghiem te » nghiem de, nghiem ve, nghiem tien
nghien te » nghiep ke, nghiep tu, hien te
thu sach » tu sach, thuat sach, thuoc sach
sach vao » sach dao, sach va, sach bao
tu cach » tu cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach thoi nghiem te hoc ) or ( thu sach vao nghien te hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thoi nghiem te hoc ) OR ( thu sach vao nghien te hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thoi nghiem te hoc ) or ( thu sach vao nghien te hoc ))*.