Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh viet » ninh viet, trinh vat
sach thue » sach thu, sach thieu, sach tham
nghiem du » nghiem dau, nghiem d, nghiem de
sach bai » sach dao, cac bai, sach xa
viet de » biet de, viet da, viet du
de hoc » te hoc, dien hoc
du hoc » tu hoc, duoc hoc

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 viet de hoc ) or ( thu ((sach bai) or (sach thue)) nghiem du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc hanh trinh viet de hoc ) OR ( thu ((sach bai) OR (sach thue)) nghiem du hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuc hanh trinh viet de hoc ) or ( thu ((sach bai) or (sach thue)) nghiem du hoc ))*.