Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
cua thong » cua thuong, cua khong, cua tong
van manh » van minh, van anh, van hanh
cong dan » cong san, cong tan, huong dan
anh anh » thanh anh, hinh anh, minh anh
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (dien sach)) - ((anh anh) or (van manh)) cua thong cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (dien sach)) - ((anh anh) OR (van manh)) cua thong cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (dien sach)) - ((anh anh) or (van manh)) cua thong cong dan van ban*.