Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nghiem dau » nghiep dau, nghiem va, nghiem ban
trinh vat » trinh van, trinh luat, sinh vat
sach bai » sach dao, cac bai, sach xa
sach thu » sach thue, sach thieu, sach tham
dau hoc » dai hoc, du hoc, dan hoc
vat te » vat tu, vat de

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuc hanh trinh vat te hoc ) or ( thu ((sach bai) or (sach thu)) nghiem dau hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc hanh trinh vat te hoc ) OR ( thu ((sach bai) OR (sach thu)) nghiem dau hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuc hanh trinh vat te hoc ) or ( thu ((sach bai) or (sach thu)) nghiem dau hoc ))*.