Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
luan thong » luan phong, luan tuong, luat thong
thong cong » trong cong, tong cong, thong thong
tang luan » dung luan
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
anh tang » anh bang, anh dang, anh nang
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: theo ((chieu sach) or (chinh sach)) - anh tang luan thong cong hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chinh sach)) - anh tang luan thong cong hach toan cao*.