Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cong tuan » cong tan, cong luan, cong thanh
tuan hang » tuan hoang, tuan bang, tuan dang
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - thanh cong tuan hang cong ((tac toan) or (tam toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - thanh cong tuan hang cong ((tac toan) OR (tam toan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh cong tuan hang cong ((tac toan) or (tam toan)) tap*.