Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
quan thanh » ban thanh, van thanh
cong quan » cuong quan, cong quang, tong quan
hieu van » hieu va, thien van, lieu va
va thong » va thuong, va phuong, he thong
thanh ca » thanh cha, thanh cac, thanh ha
cong va » dong va, cong ha, cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((thieu sach) or (hieu van)) - thanh cong va thong cong quan thanh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (hieu van)) - thanh cong va thong cong quan thanh ca.
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) or (hieu van)) - thanh cong va thong cong quan thanh ca*.