Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
va trong » va truong, va thong, va tuong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - ((hanh hang) or (hang hang)) va trong cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh hang) OR (hang hang)) va trong cong tac toan tap*.