Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
anh tang » anh bang, anh dang, anh nang
va thong » va thuong, va phuong, he thong
cong nam » dong nam, uong nam, thong nam
toan ban » van ban
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - anh tang va thong cong nam ((((toan cao) or (toan tap))) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh tang va thong cong nam ((((toan cao) OR (toan tap))) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang va thong cong nam ((((toan cao) or (toan tap))) or (toan ban))*.