Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trung cap » truong cao
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: doi chieu sach - hanh ((trung cap) or (trung tam)) thong cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trung cap) OR (trung tam)) thong cong tac toan ban.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trung cap) or (trung tam)) thong cong tac toan ban*.