Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dien sach » dien anh
nhan lang » nhanh lang, nhan dang, nhon lang
lang luan » tang luan, hang luan, bang luan
van thong » van thuong, van phong, va thong
thong van » trong van, thong va, thong quan
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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)) - nhan lang luan van thong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (chieu sach)) - nhan lang luan van thong van tan tap*.