Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
van nang » van quang, van ban, van dong
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan
va bang » va nang, va lang, va ban

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 sach - thanh tung ((va bang) or (van nang)) song ((tan toan) or (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh tung ((va bang) OR (van nang)) song ((tan toan) OR (tap toan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh tung ((va bang) or (van nang)) song ((tan toan) or (tap toan)) cao*.