Perhaps you should try some spelling variations:
phan phong » phap phong, phan hong, phan thong
cdien sach » chieu sach, kien sach
dien sach » dien anh
luan phan » luan van, luan hoan
phong van » phung van, thong van, phong va
nhan dan » phan dau, gian dan, nhan tai
dan luan » doanh luan, dung luan, tang luan
van van » tan van, san van, van vat

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)) - nhan dan luan phan phong van van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (cdien sach)) - nhan dan luan phan phong van van ban*.