Perhaps you should try some spelling variations:
thong cong » trong cong, thong thong, phong chong
hien sach » dien sach, kien sach, thien hach
tong cong » trong cong, cong cong, dung cong
canh ban » can ban, canh dan, canh van
ban cua » ban quan
dan van » dang van, doan van, tan van
dao van » do van, dang van

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

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