Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
theo sach » thuoc sach, te sach, theo lich
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
bieu toan » hieu toan, kiem toan, dien toan
bien soan » bien so

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (chieu sach)) - thanh trung cua thong cong ((bieu toan) OR (bien soan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (chieu sach)) - thanh trung cua thong cong ((bieu toan) OR (bien soan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((theo sach) or (chieu sach)) - thanh trung cua thong cong ((bieu toan) OR (bien soan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (chieu sach)) - thanh trung cua thong cong ((bieu toan) OR (bien soan)) tap*.