Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh dung » thanh duong, thanh tung, thanh hung
luan phung » luan phuong, luan chung, luan phong
phung cong » nhung cong, phong cong, nhung chong
hieu lang » chieu sang, hieu quang, nhieu tang
cong ky » cuong ky, cong ty, hong ky
ky dan » ky dang, ky danh, ke dan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sach) or (hieu lang)) - thanh dung luan phung cong ky dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (hieu lang)) - thanh dung luan phung cong ky dan ca.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (hieu lang)) - thanh dung luan phung cong ky dan ca*.