Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
trinh luan » trinh luat, trinh quan, trinh toan
trinh han » trinh quan
hung cong » nhung cong, hung cuong, phung cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (chiet tach)) - hanh ((trinh luan) OR (trinh han)) hung cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - hanh ((trinh luan) OR (trinh han)) hung cong tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (chiet tach)) - hanh ((trinh luan) OR (trinh han)) hung cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chiet tach)) - hanh ((trinh luan) OR (trinh han)) hung cong tac toan ban*.