Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
tran trong » gian trong, quan trong, tran hong
dung cong » dung trong
trong su » trong san, trong thu, trong qua
tap toan » tap quan, bai toan
tap doan » tap quan

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

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