Perhaps you should try some spelling variations:
chiet tach » chieu sach
tran tuan » tran xuan, tran quang, tran thanh
tranh cua » doanh cua, manh cua
ho chiet » ho chieu, ho thiet, hoc thiet
trong ca » trong cac, trong nha
toan tap » toan ban
ca toan » cua toan, va toan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - hanh ((tran tuan) or (tranh cua)) dung trong ca toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((tran tuan) OR (tranh cua)) dung trong ca toan tap*.