Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, thong thong, phong chong
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
bieu toan » hieu toan, kiem toan, bien soan
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: hoc ((thieu sach) or (chieu sach)) - thanh trung cua ((thong cong) OR (tong cong)) bieu toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - thanh trung cua ((thong cong) OR (tong cong)) bieu toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (chieu sach)) - thanh trung cua ((thong cong) OR (tong cong)) bieu toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chieu sach)) - thanh trung cua ((thong cong) OR (tong cong)) bieu toan tap*.