Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
phan thong » phan thuong, phan hong, phan tong
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
thong van » trong van, thong va, thong quan
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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