Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
tung quan » tuong quan, trung quan, dung quan
quan dung » quang dung, quan duong, qua dung
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu tinh) or (chieu sach)) - thanh tung quan dung trong ((tap toan) or (tap quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (chieu sach)) - thanh tung quan dung trong ((tap toan) OR (tap quan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (chieu sach)) - thanh tung quan dung trong ((tap toan) or (tap quan)) cau*.