Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dien sach » dien anh
van phong » van dong, hai phong
phong van » phung van, thong van, phong va
phan dat » phan dai, phan day, nhan dat
dat luan » dan luan, dau luan, dat quang
van phan » van thanh, luan phan, van ban
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dien sach) or (chieu sach)) - phan dat luan van phong van phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (chieu sach)) - phan dat luan van phong van phan dau*.