Perhaps you should try some spelling variations:
cdien sach » chieu sach, kien sach
van thuong » va thuong, van chuong, van phuong
thuong van » thong van, truong van, thuong va
dien sach » dien anh
nhan lang » nhanh lang, nhan dang, nhon lang
lang luan » tang luan, hang luan, bang luan
van toan » van tuan, van tan, van thanh
toan ban » van ban

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