Perhaps you should try some spelling variations:
cdien sach » chieu sach, kien sach
dien sach » dien anh
nhan lang » nhanh lang, nhan dang, nhon lang
lang luan » tang luan, hang luan, bang luan
luan phan » luan van, luan hoan
phan cong » thanh cong
cong van » cong vang, cong san, song van
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 lang luan phan cong van van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (cdien sach)) - nhan lang luan phan cong van van ban*.