Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
phung cong » nhung cong, nhung chong, dung cong
phong cong » phong chong, thong cong, chong cong
hieu lang » chieu sang, hieu quang, nhieu tang
tran van » luan van
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chinh sach) or (hieu lang)) - thanh tran van ((phung cong) OR (phong cong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - thanh tran van ((phung cong) OR (phong cong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chinh sach) or (hieu lang)) - thanh tran van ((phung cong) OR (phong cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - thanh tran van ((phung cong) OR (phong cong)) dan toan ban*.