Perhaps you should try some spelling variations:
cdien sach » chieu sach, kien sach
dien sach » dien anh
van phong » van dong, hai phong
phong van » phung van, thong van, phong va
phan dat » phan dau, phan dai, phan day
dat luan » dan luan, dau luan, dat quang
van phan » van thanh, luan phan, van ban
phan lap » phan 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 (cdien sach)) - phan dat luan van phong van phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (cdien sach)) - phan dat luan van phong van phan lap*.