Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
dung cong » dung trong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((te sach) or (chieu sach)) - hanh ((trinh cua) or (trinh quan)) dung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((te sach) OR (chieu sach)) - hanh ((trinh cua) OR (trinh quan)) dung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: toc ((te sach) or (chieu sach)) - hanh ((trinh cua) or (trinh quan)) dung cong san toan ban*.